Common Core: 1st Grade Math : Geometry

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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Example Questions

Example Question #1 : Reason With Shapes And Their Attributes

Why is this shape a rectangle?

 Screen shot 2015 07 21 at 2.55.11 pm

Possible Answers:

Because it has  sides

Because it has  sides, and the opposite sides equal each other

Because it has  equal sides

Because it is bigger than a square

Because its color is blue

Correct answer:

Because it has  sides, and the opposite sides equal each other

Explanation:

A rectangle has  sides, and the opposite sides have to be equal.

Example Question #2 : Reason With Shapes And Their Attributes

Why is this shape a circle? 

Screen shot 2015 07 21 at 2.57.52 pm

Possible Answers:

Because it is a flat shape

Because it is a round, closed shape

Because it is small

Because its color is blue

Beacause it has 4 sides 

Correct answer:

Because it is a round, closed shape

Explanation:

A circle is a round shape, with no sides or edges.

Example Question #3 : Reason With Shapes And Their Attributes

Why is this shape an octagon? 

Screen shot 2015 07 21 at 3.09.52 pm

Possible Answers:

Because it looks like a stop sign

Because it has  sides

Because it has  sides

Because it is blue

Because it has  sides 

Correct answer:

Because it has  sides

Explanation:

An octagon has  sides.

Example Question #4 : Reason With Shapes And Their Attributes

Why is this shape a heptagon? 

Screen shot 2015 07 21 at 3.06.57 pm

Possible Answers:

Because its blue

Because it has  sides

Because it has  sides

Because it has  sides

Because it is an open shape

Correct answer:

Because it has  sides

Explanation:

A heptagon has  sides.

Example Question #5 : Reason With Shapes And Their Attributes

Why is this shape a hexagon?

 Screen shot 2015 07 21 at 3.03.24 pm

Possible Answers:

Because it has  sides

Because it has  sides 

Because it has more sides than a pentagon

Because it has  sides

Because it is blue

Correct answer:

Because it has  sides 

Explanation:

A hexagon has  sides.

Example Question #6 : Reason With Shapes And Their Attributes

Why is this shape a pentagon? 

Screen shot 2015 07 21 at 3.00.06 pm

Possible Answers:

Because it has  sides

Becuase it has  sides

Because it has more sides than a square

Because it is blue

Because it has  sides

Correct answer:

Because it has  sides

Explanation:

A pentagon has  sides.

Example Question #7 : Reason With Shapes And Their Attributes

Why is this shape a trapezoid?

 Screen shot 2015 07 21 at 3.13.10 pm

Possible Answers:

Because it has  equal sides

Because it has  sides 

Because it is blue 

Because it looks like a roof

Because it has  sides and one set of parallel lines

Correct answer:

Because it has  sides and one set of parallel lines

Explanation:

A trapezoid has  sides, and only one set of parallel lines.

Example Question #8 : Reason With Shapes And Their Attributes

Why is this shape NOT a square?

 Screen shot 2015 07 21 at 2.55.11 pm

Possible Answers:

Because it does not have  sides

Because it is blue

Because it does not have  equal sides

 

Because it is flat

Because it does not have  sides

Correct answer:

Because it does not have  equal sides

 

Explanation:

A square has to have  equal sides, and this shape does not have  equal sides. 

Example Question #9 : Reason With Shapes And Their Attributes

Why is this shape NOT a circle?

 Screen shot 2015 07 21 at 3.22.18 pm

Possible Answers:

Because it is blue

Because it has  sides

Because it is flat

  Because it is an open shape

Because it has sides
  

Correct answer:

Because it has sides
  

Explanation:

A circle does not have sides, and this shape has  sides. 

Example Question #17 : Triangles

Why is this shape NOT a triangle? 

Screen shot 2015 07 21 at 2.45.18 pm

Possible Answers:

Because it does not have  sides

Because it is blue

Because it does have  sides

 Because it is not a closed shape

Because it is flat

Correct answer:

Because it does not have  sides

Explanation:

A triangle has  sides, and this shape has .

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