Name __________________________________ Date _______
Surface Area Of A Sphere
Example using 3.14 for pi.
Example when expressing in terms of pi.
2
2
SA = 4πr
SA = 4πr
SA = 4 ● 3.14 ● 8 ● 8
SA = 4 ● π ● 8 ● 8
8 cm
SA = 12.56 ● 64
SA = 4 ● π ● 64
2
SA ≈ 803.84 cm
8 cm
SA = 256 ● π
2
SA ≈ 256 π cm
Directions: For the next 6 problems, find the surface area of each sphere. Use 3.14 for pi. Round each answer to the nearest tenth.
1)
2)
6 mm
3)
3 cm
4)
2 in.
5)
6)
18 m
ID# 0047
12 ft.
15 cm
Directions: For the next 8 problems, find the surface area of each sphere. Express your answer in terms of pi.
7)
8)
6.5 mm
9)
14 yds.
10)
3.5 m
30 in.
11)
12)
9 yds.
13)
14)
24 in.
ID# 0047
11 cm
4.5 in.
Name __________________________________ Date _______
Surface Area Of A Sphere
Example using 3.14 for pi.
Example when expressing in terms of pi.
2
2
SA = 4πr
SA = 4πr
SA = 4 ● 3.14 ● 8 ● 8
SA = 4 ● π ● 8 ● 8
8 cm
SA = 12.56 ● 64
SA = 4 ● π ● 64
2
SA ≈ 803.84 cm
8 cm
SA = 256 ● π
2
SA ≈ 256 π cm
Directions: For the next 6 problems, find the surface area of each sphere. Use 3.14 for pi. Round each answer to the nearest tenth.
1)
2)
6 mm
2
SA ≈ 452.2 mm
3)
SA ≈ 113 cm
12 ft.
SA ≈ 1,808.6 ft.
15 cm
SA ≈ 2,826 cm
4)
2 in.
SA ≈ 50.2 in.
2
5)
2
6)
18 m
ID# 0047
2
3 cm
2
SA ≈ 4,069.4 m
2
Directions: For the next 8 problems, find the surface area of each sphere. Express your answer in terms of pi.
7)
8)
6.5 mm
2
SA ≈ 169 π mm
9)
2
SA ≈ 784 π yds.
10)
30 in.
SA ≈ 3,600 π in.
2
11)
3.5 m
2
SA ≈ 49 π m
12)
9 yds.
SA ≈ 324 π yds.
2
13)
11 cm
2
SA ≈ 484 π cm
14)
24 in.
ID# 0047
14 yds.
SA ≈ 2,304 π in.
2
4.5 in.
SA ≈ 81π in.
2