All the solutions provided in **McGraw Hill My Math Grade 1 Answer Key PDF Chapter 9 Lesson 2 Triangles and Trapezoids **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 9 Lesson 2 Triangles and Trapezoids

**Explore and Explain**

How many ? ____________

How many ? ____________

**Teacher Directions:** Use trapezoid and triangle pattern blocks. Find the white shapes in the picture. Color the trapezoids red. Color the triangles green. Write how many of each shape you colored. Describe the shapes.

Answer:

Explanation:

I used trapezoid and triangle pattern blocks

I found the white shapes in the picture

I colored the trapezoids red and colored the triangles green

There 1 trapezoid and 5 triangles.

**See and Show**

Triangles and trapezoids are two-dimensional shapes. They are closed. They have straight sides and vertices.

triangle

trapezoid

**Write how many sides and vertices.**

Question 1.

___________ sides

___________ vertices

Answer:

3 sides

3 vertices

Explanation:

A triangle is a closed figure that has 3 sides and 3 vertices.

Question 2.

___________ sides

___________ vertices

Answer:

4 sides

4 vertices

Explanation:

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length.

Question 3.

___________ sides

___________ vertices

Answer:

4 sides

4 vertices

Explanation:

The given object is in the shape of a trapeziod

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length

Question 4.

___________ sides

___________ vertices

Answer:

3 sides

3 vertices

Explanation:

The above given object is in the shape of a triangle

A triangle is a closed figure that has 3 sides and 3 vertices.

**Talk Math** How are a triangle and a trapezoid different?

Answer:

A triangle has only 3 sides and a trapezoid has 4 sides.

**On Your Own**

**Write how many sides and vertices.**

Question 5.

___________ sides

___________ vertices

Answer:

4 sides

4 vertices

Explanation:

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length.

Question 6.

___________ sides

___________ vertices

Answer:

3 sides

3 vertices

Explanation:

A triangle is a closed figure that has 3 sides and 3 vertices

**Circle the objects that match the description.**

Question 7.

4 sides

4 vertices

Answer:

Explanation:

I drew a circle around the object that has 4 sides and 4 corners.

Question 8.

3 sides

3 vertices

Answer:

Explanation:

I drew a circle around the circle that has 3 sides and 3 vertices.

**Circle the closed shapes.**

Question 9.

Answer:

Explanation:

I drew circles around the closed shapes.

**Problem Solving**

**Draw and write the name of each shape.**

Question 10.

I am a two-dimensional shape that has 3 sides and 3 vertices. What shape am I?

Answer:

Explanation:

3 sides

3 vertices

A triangle is a closed figure that has 3 sides and 3 vertices

Question 11.

I am a two-dimensional shape that has 4 sides and 4 vertices. Only 2 of my sides are the same length. What shape am I?

Answer:

Explanation:

4 sides

4 vertices

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length

**HOT Problem** Ty has 3 different shapes. The shapes have 11 sides and 11 vertices in all. What shapes can he have? Explain.

Answer:

He can have 2 trapezoids and 1 triangle

Trapezoid has 4 sides

A triangle has 3 sides

So, 4 + 4+ 3 = 11

Therefore, Ty ha s2 trapezoids and 1 traingle.

### McGraw Hill My Math Grade 1 Chapter 9 Lesson 2 My Homework Answer Key

**Practice**

**Write how many sides and vertices.**

Question 1.

_________ sides

_________ vertices

Answer:

3 sides

3 vertices

Explanation:

A triangle is a closed figure that has 3 sides and 3 vertices

Question 2.

_________ sides

_________ vertices

Answer:

4 sides

4 vertices

Explanation:

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length

Question 3.

_________ sides

_________ vertices

Answer:

4 sides

4 vertices

Explanation:

A trapezoid is a shape that has 4 sides and 4 vertices and only 2 of my sides are the same length

Question 4.

_________ sides

_________ vertices

Answer:

3 sides

3 vertices

Explanation:

A triangle is a closed figure that has 3 sides and 3 vertices

Question 5.

Color all of the triangles red. Color all of the trapezoids purple. Then write how many.

___________ triangles

___________ trapezoids

Answer:

Explanation:

I colored the triangles red and the trapezoids in purple

There are 4 triangles and 2 trapezoid

**Draw and write the name of the shape.**

Question 6.

I am a two-dimensional shape that has less than 4 sides. All of my sides are straight. What shape am I?

Answer:

Explanation:

3 sides

3 vertices

A triangle is a closed figure that has 3 sides and 3 vertices

**Vocabulary Check**

**Draw lines to match.**

Answer:

Explanation:

I matched the given two-dimensional shapes with their names.

**Math at Home** Have your child compare a triangle and a trapezoid using words such as sides and vertices.

Answer: