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Help me find the area of a circle

How to find the area of a circle if you have the diameter?

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Answer #1

area of a cricle is: Pi x r^2 and diameter is twice the radius

so, if you have diameter…u can divide it by 2 to get the radius and then plug it into the equation for area of a circle…easy peasy man

Answer #2

Ok, example: D= 7, if it says to put π as 3.14, youd 7 x 3.14, or if it says leave it as π, get a scientific calculator and type in 7 x π and hit equal… Im in 8th grade and know how to do it. A simple way to remember is π r ^2(π r (r= radius) squared)

Answer #3

the area of a circle is : radius squared, multiplied by π. I.e radius = half the diameter 14/2 = 7inches 7 squared = 7x7 = 49 π = 3.14

so Area = 49 x 3.14 =153.86 inches squared

this is how I’d do it but I aint the best at maths so people feel free to correct me =] hope I helped.

Answer #4

Pi are squared

so if you have the diameter divide by 2 square it then multiply by pi

e.g. diameter = 8

8/2 = 4 4 squared = 16 16 times pi = 50.256

Answer #5

uhm no guardian115, pi “r” sqared for D=7 would be 3.5 squared… not 7 times pi

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