9.09 Classify 2D figures

Lesson

Practice

Lesson

Are you ready?

Being able to identify parallel lines can help us in this lesson.

Select the diagram showing a pair of parallel $lines$ :

A
B
C
D

Learn

This video shows you how to classify shapes based on a number of key features including sides and angles.

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Apply

Select all $parallelograms$ :

A four-sided shape has two pairs of opposite, parallel sides marked with arrowheads. One pair is marked with single arrowheads, and the other pair is marked with double arrowheads.

A

A four-sided convex polygon has four sides of unequal lengths. All sides are unmarked.

B

A four-sided shape has two pairs of adjacent sides marked with tick marks. One pair is marked with single tick marks, and the other pair is marked with double tick marks.

C

A four-sided shape has two pairs of opposite, parallel sides marked with arrowheads. One pair is marked with single arrowheads, and the other pair is marked with double arrowheads.

D

A four-sided concave polygon has four sides of unequal lengths. All sides are unmarked.

E

A four-sided shape has two pairs of adjacent sides marked with tick marks. One pair is marked with single tick marks, and the other pair is marked with double tick marks.

F

Remember!

To name a shape, look at its key features, including sides, angles, and vertices.

Outcomes

4.G.A.2

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.