Refer to our Texas Go Math Grade 8 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 8 Module 10 Answer Key Surface Area.

## Texas Go Math Grade 8 Module 10 Answer Key Surface Area

**Texas Go Math Grade 8 Module 10 Are You Ready? Answer Key**

**Find the area of each figure.**

Question 1.

square with side lengths of 9.3 cm __________

Answer:

Given,

length of the side = 9.3 cm

We have to find the area of a square.

We know that,

Area of a square = s × s

A = 9.3 × 9.3

A = 86.49 sq. cm

Thus the area of the square is 86.49 sq. cm.

Question 2.

triangle with base 14 in. and height 7 in ____________

Answer:

Given,

base = 14 in.

height = 7 in.

We know that,

Area of a triangle = 1/2 × base × height

Area = 1/2 × 14 × 7

A = 7 × 7

A = 49 sq. inches

Thus the area of the triangle is 49 sq. inches.

Question 3.

rectangle with length 2\(\frac{1}{2}\) ft and width 1\(\frac{1}{2}\) ft ___________

Answer:

Given,

length = 2\(\frac{1}{2}\) ft

width = 1\(\frac{1}{2}\) ft

We know that,

Area of a rectangle = length × width

A = \(\frac{5}{2}\) × \(\frac{3}{2}\)

A = \(\frac{15}{2}\)

A = 7\(\frac{1}{2}\) sq. ft

Thus the area of a rectangle is 7\(\frac{1}{2}\) sq. ft

Question 4.

triangle with base 6.4 m and height 3.8 m ___________

Answer:

Given,

base = 6.4 m

height = 3.8 m

We know that,

Area of a triangle = 1/2 × base × height

Area = 1/2 × 6.4 m × 3.8 m

A = 3.2 × 3.8

A = 12.16 sq. meters

Thus the area of the triangle is 12.16 sq. meters

**Find the area of each circle. Use 3.14 for π.**

Question 5.

r = 18 in. _________

Answer:

Given,

radius = 18 inches

We know that,

Area of a circle = πr²

Area = 3.14 × (18)²

Area =1017.88 sq. inches

Thus the area of the circle is 1017.88 sq. inches.

Question 6.

r = 7.5 m __________

Answer:

Given,

radius = 7.5 m

We know that,

Area of a circle = πr²

Area = 3.14 × (7.5)²

Area =176.71 sq. meters

Thus the area of the circle is 1017.88 sq. meters.

Question 7.

r = 2\(\frac{1}{2}\) ft ___________

Answer:

Given,

radius =2\(\frac{1}{2}\) ft

We know that,

Area of a circle = πr²

Area = 3.14 × (2\(\frac{1}{2}\))²

Area =19.63 sq. ft

Thus the area of the circle is 19.63 sq. ft

**Texas Go Math Grade 8 Module 10 Reading Start-Up Answer Key**

**Visualize Vocabulary**

Use the ✓ words to complete the chart.

**Understand Vocabulary**

**Complete the sentences using the review words.**

Question 1.

A three-dimensional figure in which six faces are rectangles is a ___________.

Answer: A three-dimensional figure in which six faces are rectangles is a **cuboid**.

Question 2.

An individual surface of a solid object is a ____________.

Answer: An individual surface of a solid object is a face.

**Active Reading**

Tri-Fold Before beginning the module, create a tri-fold to help you learn the concepts and vocabulary in this module. Fold the paper into three sections. Label the columns “What I Know”, “What I Need to Know,” and “What I Learned.” Complete the first two columns before you read. After studying the module, complete the third column.