Unit 12 Two-Dimensional Shapes

The fifth grade class is designing a new stage for the school play. Below is one of the designs they are considering. What is the name of the polygon?

• quadrilateral

• hexagon

• triangle

• pentagon

Mrs. Wang asked Molly to draw an octagon on the board. If Molly drew the octagon correctly, how many sides did she draw?

• 7

• 8

• 9

• 11

How many regular hexagons do you see in the figure?

• 1

• 2

• 3

• 4

Which polygon is a pentagon?

• A

• B

• C

• D

Which type of polygon has 6 sides?

• quadrilateral

• octagon

• pentagon

• hexagon

What is the measure of the unknown angle?

• 40

• 50

• 180

• 220

Which of the following is an obtuse, scalene triangle?

• A

• B

• C

• D

Dan cut his square sandwich in half as shown below. Which type of triangles are formed?

• equilateral triangles

• right, isosceles triangles

• acute, isosceles triangles

• right, scalene triangles

How many acute angles does an obtuse triangle have?

• 0

• 1

• 2

• 3

What is the sum of the angle measures of a triangle?

• 60

• 90

• 180

• 360