What is the area for a circle with diameter of 10?

Answer 1

the formula for the area of a circle is A=pi x r2. r=the radius, and the radius is half of the diameter, which in this case, is 10. so the radius is 5. now you just plug it in. A=pi x 5 squared. now A=pi x 25 so the answer is 25pi. or you could do it to where you set pi as 3.14. then your answer would be 3.14x25 which is 78.5, so A=78.5 some teachers like it when you set pi to 3.14, and others like you to leave it just as pi. i personally like to leave pi as it is because its less work, but i don't know which one you needed...