measure of lengths of segments and arcs
what is the diameter of a circle if its area is 100pi cm^2 ?
First,write the formula,
now, substitute in what you know.
100 pi=r^2 pi
by dividing both sides of equation by pi
then,take the square root of both sides
Remember that you are solving for diameter
the answer is the diameter , d= 20
The area of circle is 25 pi . what is the radius?
first write the formula , A=pi r^2
substitute in what you know.
25pi = r^2pi
by dividing both sides of the eq. by pi
take the square root of both sides
the answer is r=5 .
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