Find area of a circle with radius?

Answer 1

Assuming you mean how to make a computer program that can do that, and since you didn't specify a language here's the pseudocode:

//area = pi*r^2

function findArea(radius)

pi = 3.14 //Establish a pi variable

rSquared = radius * radius //radius squared variable, makes it look clean

area = pi * rSquared //doing the actual problem

return area //return the area, could also print area

Just translate that and feel free to use any built in functions in your language like a square root function, this should just give you an idea. The double slash marks (//) are comments.