### All Common Core: 8th Grade Math Resources

## Example Questions

### Example Question #1 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

Observe the location of the black and orange angles on the provided coordinate plane and identify which of the following transformations—rotation, translation, or reflection—the black angle has undergone in order to reach the position of the orange angle. Select the answer that provides the correct transformation shown in the provided image.

**Possible Answers:**

A translation to the left

A reflection over the x-axis

A rotation

**Correct answer:**

A rotation

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, notice that the black angle rotates counterclockwise, or left around the y-axis. The vertical, base, line of the angle goes from being vertical to horizontal; thus the transformation is a rotation.

The transformation can't be a reflection over the x-axis because the orange angle didn't flip over the x-axis.

The transformation can't be a translation because the angle changes direction, which does not happened when you simply move or slide an angle or image.

### Example Question #1 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

Observe the location of the black and orange angles on the provided coordinate plane and identify which of the following transformations—rotation, translation, or reflection—the black angle has undergone in order to reach the position of the orange angle. Select the answer that provides the correct transformation shown in the provided image.

**Possible Answers:**

A translation to the left

A reflection over the x-axis

A rotation

**Correct answer:**

A rotation

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, notice that the black angle rotates counterclockwise, or left around the y-axis. The vertical, base, line of the angle goes from being the base, to the top; thus the transformation is a rotation.

The transformation can't be a reflection over the x-axis because the orange angle didn't flip over the x-axis.

The transformation can't be a translation because the angle changes direction, which does not happened when you simply move or slide an angle or image.

### Example Question #1 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

Observe the location of the black and orange angles on the provided coordinate plane and identify which of the following transformations—rotation, translation, or reflection—the black angle has undergone in order to reach the position of the orange angle. Select the answer that provides the correct transformation shown in the provided image.

**Possible Answers:**

A reflection over the y-axis

A rotation

A translation down

**Correct answer:**

A rotation

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, notice that the black angle rotates clockwise, or right around the x-axis. The vertical, base, line of the angle goes from being vertical to horizontal; thus the transformation is a rotation.

The transformation can't be a reflection over the y-axis because the orange angle didn't flip over the y-axis.

The transformation can't be a translation because the angle changes direction, which does not happened when you simply move or slide an angle or image.

### Example Question #1 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

**Possible Answers:**

A rotation

A reflcetion over the y-axis

A translation down

**Correct answer:**

A rotation

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, notice that the black angle rotates clockwise, or right around the x-axis. The vertical, base, line of the angle goes from being the base, to the top; thus the transformation is a rotation.

The transformation can't be a reflection over the y-axis because the orange angle didn't flip over the y-axis.

### Example Question #2 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

**Possible Answers:**

A translation down

A rotation

Reflection over the x-axis

**Correct answer:**

Reflection over the x-axis

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused the vertical, base, line of the angle to go from being horizontal to vertical, but the line is still horizontal. The line was not moved down, as the translation is described in the answer choice, because you can tell the angle has been flipped, the straight, base line of the angle is now the top line of the angle; thus, the correct answer is a reflection over the x-axis.

### Example Question #3 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

**Possible Answers:**

A rotation

A translation left

Reflection over the y-axis

**Correct answer:**

Reflection over the y-axis

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused the vertical, base, line of the angle to go from being horizontal to vertical, but the line is still horizontal. The line was not moved to the left, as the translation is described in the answer choice, because you can tell the angle has been flipped, the opening of the angle is facing the opposite direction; thus, the correct answer is a reflection over the y-axis.

### Example Question #2 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

**Possible Answers:**

A translation down and at a diagonal

A rotation

A reflection over the y-axis

**Correct answer:**

A translation down and at a diagonal

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused the vertical, base, line of the angle to go from being horizontal to vertical, but the line is still horizontal. The line was not reflected over the y-axis because the angle was not flipped and the opening of the angle is not facing the opposite direction; thus, the correct answer is a translation down and at diagonal.

### Example Question #1 : Angles And Their Mesures: Ccss.Math.Content.8.G.A.1b

**Possible Answers:**

A translation up and to the left

A reflection over the y-axis

A rotation

**Correct answer:**

A translation up and to the left

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused the vertical, base, line of the angle to go from being horizontal to vertical, but the line is still horizontal. The line was not reflected over the y-axis because the angle was not flipped and the opening of the angle is not facing the opposite direction; thus, the correct answer is a translation up and to the left.

### Example Question #21 : Geometry

**Possible Answers:**

Translation down

A reflection over the x-axis

A rotation

**Correct answer:**

Translation down

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused the vertical, base, line of the angle to go from being horizontal to vertical, but the line is still horizontal. The line was not reflected over the x-axis because the angle was not flipped and the base of the angle is the straight line, like that of the black angle; thus, the correct answer is a translation down.

### Example Question #21 : Geometry

**Possible Answers:**

A rotation

Translation to the left

A reflection over the y-axis

**Correct answer:**

Translation to the left

First, let's define the possible transformations.

**Rotation: **A rotation means turning an image, shape, line, etc. around a central point.

**Translation:** A translation means moving or sliding an image, shape, line, etc. over a plane.

**Reflection:** A reflection mean flipping an image, shape, line, etc. over a central line.

In the images from the question, the line was not rotated because that rotation would have caused direction of the angle to turn a bit, but the angle's direction did not change. The line was not reflected over the y-axis because the angle was not flipped and the opening of the angle is not facing the opposite direction; thus, the correct answer is a translation to the left.