We included **HMH Into Math Grade 2 Answer Key PDF** **Module 21 Lesson 3 Find and Count Angles in Two-Dimensional Shapes **to make students experts in learning maths.

## HMH Into Math Grade 2 Module 21 Lesson 3 Answer Key Find and Count Angles in Two-Dimensional Shapes

I Can find and count angles in two-dimensional shapes.

**Spark Your Learning**

How can you help Cade complete his chart?

Read the following: Cade wants to make a chart of shapes with the number of sides and the number of vertices for each shape. Can you help him? Have partners compare their work. Ask what they notice about the number of sides and the number of vertices in each shape.

Answer:

Triangle: A triangle is a two-dimensional figure with three sides and three vertices.

Quadrilateral: A quadrilateral is a two-dimensional figure with four sides and four vertices.

Pentagon: A pentagon is a two-dimensional figure with five sides and five vertices.

Hexagon: A hexagon is a two-dimensional figure with six sides and six vertices.

**Build Understanding**

Question 1.

Damon wants to count the number of angles in a quadrilateral and in a triangle.

A. Circle each angle you find in this shape.

Answer:

The figure formed by two lines extending from the same point is known as the angle. The above figure is a quadrilateral that has four angles.

Connect to Vocabulary

angle:

When two sides of a shape meet, they form an angle.

B. How many angles are there?

_______ angles

Answer: There are four angles in the above figure.

C. Circle each angle you find in this shape.

Answer:

The name of the shape is triangle and we can observe three angles.

D. How many angles are there?

_________ angles

Answer: There are three angles in the above figure.

E. Draw a shape with 4 angles and circle each angle.

Answer:

The name of the shape is a rectangle and it has four angles.

**Turn and Talk** What parts of a shape make an angle?

Answer: When two rays combine with a common endpoint and the angle is formed.

Question 2.

Rosa wants to count the number of angles in a pentagon and in a hexagon.

A. Draw a pentagon and a hexagon.

Answer:

B. Circle the angles in each shape.

Answer:

C. Count the angles in each shape.

pentagon: ________ angles

hexagon: ________ angles

Answer:

A pentagon is a two-dimensional figure with five angles.

A hexagon is a two-dimensional figure with six angles.

**Turn and Talk** Look at the pentagon. How do the number of sides and the number of vertices compare to the number of angles?

Answer: The number of sides and number of vertices is equal to the number of angles.

**Check Understanding**

Question 1.

Larson has a quadrilateral with 4 sides and 4 vertices. How many angles does the quadrilateral have?

_________ angles

Answer:

The name of the shape is a trapezium and it has four angles.

A quadrilateral has four angles.

Question 2.

Which shape has more angles, a pentagon or a hexagon? Explain.

Answer:

A pentagon is a two-dimensional figure with five angles.

A hexagon is a two-dimensional figure with six angles.

Hence hexagon has more angles than a pentagon.

**On Your Own**

Question 3.

**Open-Ended** Nikolai draws a two-dimensional shape that has more angles than a triangle. Draw the shape.

Answer:

The name of the shape is a rectangle and it has four angles.

The name of the shape is a pentagon and it has five angles.

Question 4.

**Attend to Precision** Annie draws a two-dimensional shape with 4 sides and 4 angles. Draw Annie’s shape. Circle the angles.

Answer:

The name of the shape is a rectangle and it has four angles.

Question 5.

**Use Structure** Circle the shapes that have 5 angles.

Answer:

The shape with 5 angles is known as the pentagon.

**I’m in a Learning Mindset!**

What questions can I ask my teacher to help me understand angles in two-dimensional shapes?

Answer:

Suitable Questions:

1. What is an angle?

2. What parts of a shape make an angle?