Answer:
A: 15 cm, 176.71 cm²
B: 5 dm, 78.54 dm²
C: 10.5 m, 346.36 m²
Step-by-step explanation:
CIRCLE A:
diameter is 2 times the radius
d = 2r
d = 2(7.5)
d = 15 cm
A = πr²
A = (3.14)(7.5)²
A = 176.71 cm²
CIRCLE B:
the diameter is 2 times the radius,
10 dm = 2r
divide both sides by 2
r = 5 dm
A = (3.14)(5)²
A = 78.54 dm²
CIRCLE C:
21 m = 2r
r = 10.5 m
A = (3.14)(10.5)²
A = 346.36 m²
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Answers & Comments
Answer:
A: 15 cm, 176.71 cm²
B: 5 dm, 78.54 dm²
C: 10.5 m, 346.36 m²
Step-by-step explanation:
CIRCLE A:
diameter is 2 times the radius
d = 2r
d = 2(7.5)
d = 15 cm
A = πr²
A = (3.14)(7.5)²
A = 176.71 cm²
CIRCLE B:
the diameter is 2 times the radius,
10 dm = 2r
divide both sides by 2
r = 5 dm
A = πr²
A = (3.14)(5)²
A = 78.54 dm²
CIRCLE C:
the diameter is 2 times the radius,
21 m = 2r
divide both sides by 2
r = 10.5 m
A = πr²
A = (3.14)(10.5)²
A = 346.36 m²