2+2 equals what any answer is ok

The circumference of a circle is 5 pi cm. what is the area of the circle?

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

I'm marking the brainliest and it's 15 points