Lesson 2 Attributes of Triangles and Quadrilaterals

- Let’s sort shapes into more specific categories.

Warm-up True or False: Multiples of Ten

Decide if each statement is true or false. Be prepared to explain your reasoning.

$3 \times 60 = 9 \times 10$
$180 = 3 \times 60$
$6 \times 40 = 24 \times 10$
$24 \times 10 = 240$

Activity 1 Card Sort: Triangles

Sort the triangles into categories. Record your categories and be prepared to explain how you sorted the shapes.

Card sort with triangles.

Activity 2 Card Sort: Quadrilaterals

Sort the quadrilaterals into categories. Record your categories and be prepared to explain how you sorted the shapes.

Card sort with quadrilaterals.

Practice Problem

Problem 1

6 triangles labeled A to F.

Which triangles have one right angle?
Which triangles have two sides that are the same length?