B. Solve the following. 1. 2. Calculate the area, given each diameter. Use π = 3.14. 84 mm f. 13.4 units 121 cm 65 in 11 mm 21.98 a. b. g. h. i. j. Calculate the area, given each radius. Use 3.14 as the value of t. 40 mm f. 15.3 cm 9.42 ft 21.98 yd 15 ft 56 in C. e. 3 d. 0.14 m a. 2.8 m 14 C. cm d. e. b. 2.8 m 17 ft 15 units 9 cm 142.8 mm 9. h. i. j.
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Answer:
Area of circle = πr^2
a. Radius = 42 mm
Area = π(42)^2
Area ≈ 5,538.48 mm^2
b. Radius = 6.7 units
Area = π(6.7)^2
Area ≈ 141.05 units^2
c. Radius = 60.5 cm
Area = π(60.5)^2
Area ≈ 11,487.18 cm^2
d. Radius = 32.5 in
Area = π(32.5)^2
Area ≈ 3,313.16 in^2
e. Radius = 5.5 mm
Area = π(5.5)^2
Area ≈ 94.98 mm^2
f. Diameter = 40 mm
Radius = 20 mm
Area = π(20)^2
Area ≈ 1,256.64 mm^2
g. Diameter = 15.3 cm
Radius = 7.65 cm
Area = π(7.65)^2
Area ≈ 183.94 cm^2
h. Diameter = 9.42 ft
Radius = 4.71 ft
Area = π(4.71)^2
Area ≈ 69.76 ft^2
i. Diameter = 21.98 yd
Radius = 10.99 yd
Area = π(10.99)^2
Area ≈ 380.13 yd^2
j. Diameter = 15 ft
Radius = 7.5 ft
Area = π(7.5)^2
Area ≈ 176.71 ft^2
k. Diameter = 56 in
Radius = 28 in
Area = π(28)^2
Area ≈ 2,463.02 in^2
l. Diameter = 3 mm
Radius = 1.5 mm
Area = π(1.5)^2
Area ≈ 7.07 mm^2
m. Diameter = 0.14 m
Radius = 0.07 m
Area = π(0.07)^2
Area ≈ 0.0154 m^2
n. Radius = 2.8 m
Area = π(2.8)^2
Area ≈ 24.62 m^2
o. Radius = 7 cm
Area = π(7)^2
Area ≈ 153.94 cm^2
p. Radius = 8.5 mm
Area = π(8.5)^2
Area ≈ 226.98 mm^2
q. Radius = 17 ft
Area = π(17)^2
Area ≈ 907.92 ft^2
r. Radius = 7.5 units
Area = π(7.5)^2
Area ≈ 176.71 units^2
s. Radius = 4.5 cm
Area = π(4.5)^2
Area ≈ 63.62 cm^2
t. Diameter = 142.8 mm
Radius = 71.4 mm
Area = π(71.4)^2
Area ≈ 16,041.88 mm^2
u. Radius = 9 cm
Area = π(9)^2
Area ≈ 254.47 cm^2