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.
