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Answer:
Explanation:
First, observe the formula for calculating the area of a circle:
A
=
π
r
2
Where:
A
is the area of the circle
π
is the irrational number
3.14159
...
r 2
is the square of the radius of the circle.
Since the radius is half of the diameter:
r = d 2
⇒20 2
⇒ 10
∴ r 2= 10 2=100
Returning to our original equation:
A=100π = 314.16 cm 2 to 5