Step-by-step explanation:
formula for area
A = πr²
where r (radius)
r = d/2
1.
r = 8/2
r = 4
A = π (4)²
A = 50.27
2. A =π (5)²
A = 78.54
d = r(2)
d = 5(2)
d = 10
3.
r = 6.4/2
r = 3.2
A = π (3.2)²
A = 32.17
4. A =π (2)²
A = 12.57
d = 2(2)
d = 4
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Answers & Comments
Step-by-step explanation:
formula for area
A = πr²
where r (radius)
r = d/2
1.
r = 8/2
r = 4
A = π (4)²
A = 50.27
2. A =π (5)²
A = 78.54
r = d/2
d = r(2)
d = 5(2)
d = 10
3.
r = 6.4/2
r = 3.2
A = π (3.2)²
A = 32.17
4. A =π (2)²
A = 12.57
r = d/2
d = r(2)
d = 2(2)
d = 4