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A = pi r^2
C = 2 pi r or pi d
NB 2r = d
This is elementary school maths.
Hence if d = 2r 8 , then r = 8/2 = 4
Hence
A = pi 4^2
A = 16 pi
pi is a constant at 3.141592....
A = 16*3.41592.... = 50.26554.... units^2
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Continue Learning about Statistics
The diameter of a circle is 2.42 m Calculate its area in proper?
Area is 4.6 m2
What is the formula for the area of the circle given the diameter?
in place of r (radius) write d/2 where d is diameter
What is the radii of a circle?
The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.
What is the formula to get pi?
Take the circumference of a circle and divide it by the diameter of that circle: ∏=C/D
How do you find the diameter of a circle if you have the circumfrence?
divide by pi which is 3.1415927 and on and on
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