circumference = 2pi * radius
42pi = 2pi * radius
radius = 21 in
area = pi radius^2 = pi(21^2) = 441pi in^2
Circumference is 2Ïr. This means:
2Ïr=42Ï
Hence
r=21.
Area of circle is Ïr².
Plotting the values,
A=Ï(21)²=Ï441
Area is 441Ï
circumference = Ïd
d = 42 in
r = 21 in
area = Ïr² = 441Ï in²
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Verified answer
circumference = 2pi * radius
42pi = 2pi * radius
radius = 21 in
area = pi radius^2 = pi(21^2) = 441pi in^2
Circumference is 2Ïr. This means:
2Ïr=42Ï
Hence
r=21.
Area of circle is Ïr².
Plotting the values,
A=Ï(21)²=Ï441
Area is 441Ï
circumference = Ïd
d = 42 in
r = 21 in
area = Ïr² = 441Ï in²