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The diameter of a circle is two times it’s radius. What equation shows another way to represent the area of a circle ?

User Chamil
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2 Answers

1 vote
A = (πD^2)/4. d = diameter
User Anabar
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8.5k points
4 votes
Area of the circle can be written as:


Area= \pi r^(2)

Diameter is twice the radius, which means

Diameter = d = 2r
or
r = d/2

Using this value of r, we can write the equation for Area as:


Area= \pi ( (d)/(2))^(2) \\ \\ Area= ( \pi d^(2) )/(4)
User Joemeilinger
by
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