Question

Relation between area of circle ,perimeter of circle and diamter

Answer 1

area of circle is π*r²
perimeter of circle is 2πr

so by multiplying r in the perimeter of the circle we have 2πr²

=>perimeter = 2 area of circle
now by multiplying 2r(diameter) in the perimeter
perimeter = 4πr²
perimeter = 4 area of circle