### All Common Core: High School - Geometry Resources

## Example Questions

### Example Question #1 : Draw Generalized Transformed Figures

If a triangle is in quadrant three and undergoes a transformation that moves each of its coordinate points to the left three units and down one unit, what transformation has occurred?

**Possible Answers:**

Rotation

Reflection

None of the other answers.

Translation

Extension

**Correct answer:**

Translation

To determine the type of transformation that is occurring in this particular situation, first recall the different types of transformations.

Translation: To move an object from its original position a certain distance without changing the object in any other way.

Transformation: Refers to any of the four changes that can be done to an object geographically. Transformations include, reflections, translations, rotations, and resizing the object.

Reflection: To flip the orientation of an object over a specific line or function.

Rotation: To rotate an object either clockwise or counter clockwise around a center point.

Since each of the triangle's coordinates is moved to the left and down, it is seen that the size and shape of the triangle remains the same but its location is different. Therefore, the transformation the triangle has undergone is a translation.

### Example Question #2 : Draw Generalized Transformed Figures

If a rectangle has the coordinate values, , , , and and after a transformation results in the coordinates , , , and identify the transformation.

**Possible Answers:**

None of the other answers.

Extension

Dilation

Reflection

Rotation

**Correct answer:**

Reflection

"If a rectangle has the coordinate values, , , , and and after a transformation results in the coordinates , , , and identify the transformation."

A transformation that changes the values by multiplying them by negative one is known as a reflection across the -axis or the line

Therefore, this particular rectangle is being reflected across the -axis because the opposite of all the values have been taken.

### Example Question #3 : Draw Generalized Transformed Figures

If a rectangle has the coordinate values, , , , and and after a transformation results in the coordinates , , , and identify the transformation.

**Possible Answers:**

Rotation

Dilation

None of the other answers.

Translation

Reflection

**Correct answer:**

Translation

To identify the transformation that is occurring in this particular problem, recall the different transformations.

Translation: To move an object from its original position a certain distance without changing the object in any other way.

Transformation: Refers to any of the four changes that can be done to an object geographically. Transformations include, reflections, translations, rotations, and resizing the object.

Reflection: To flip the orientation of an object over a specific line or function.

Rotation: To rotate an object either clockwise or counter clockwise around a center point.

Looking at the starting and ending coordinates of the rectangle,

, , , and to , , , and

Since all the coordinates are increasing by two this is known as a translation.

### Example Question #4 : Draw Generalized Transformed Figures

If a rectangle has the coordinate values, , , , and and after a transformation results in the coordinates , , , and identify the transformation.

**Possible Answers:**

Reflection

Dilation

Rotations

Extension

None of the others

**Correct answer:**

Reflection

"If a rectangle has the coordinate values, , , , and and after a transformation results in the coordinates , , , and identify the transformation."

A transformation that changes the values by multiplying them by negative one is known as a reflection across the -axis or the line

Therefore, this particular rectangle is being reflected across the -axis because the opposite of all the values have been taken.

### Example Question #1 : Draw Generalized Transformed Figures

Assume the values a, b, c, and d are all positive integers. If a rectangle has the coordinate values, (a,b), (c,b), (a,d), and (c,d) and after a transformation results in the coordinates (a,b), (2c,b), (a,2d), and (2c,2d) identify the transformation.

**Possible Answers:**

Rotation

Transformation

Dilation

None of the above

Reflection

**Correct answer:**

Dilation

The above described transformation is a dilation. Notice that one point, (a,b), stays the same before and after the transformation. The point (c,b) retains the same y value of b, but c is dilated into 2c, extending the base of the rectangle. The point (a,d) is similar in that the x value of a stays the same, but the y value of d is extended or dilated to 2d. The final point (c,d) is extended in both length and width to become (2c,2d). The below graph shows the original figure in blue and the dilated larger figure in pink.

### Example Question #2 : Draw Generalized Transformed Figures

Imagine a triangle with vertices located at the points (a,b), (c,d), and (e,f). If this figure were rotated 180^{o} about the origin, what would be the new coordinates of the triangle's vertices?

**Possible Answers:**

(a,b), (c,d), and (e,f)

(-a,b), (-c,d), and (-e,f)

(a,b), (-c,-d), and (-e,-f)

(-a,-b), (-c,-d), and (-e,-f)

(a,-b), (c,-d), and (e,-f)

**Correct answer:**

(-a,-b), (-c,-d), and (-e,-f)

The correct answer is (-a,-b), (-c,-d), and (-e,-f). In other words, you'd just take the opposite value of each x and y value of each vertex of the triangle. The following diagram shows one set of vertexes rotated 180^{o} about the origin to help demonstrate this.

Please note that if one of our original points had any negative values, such as the point (2,-2), and we rotated it 180o about the origin, the signs of both the x and y values would change, and this point's image after translation would be (-2,2).