Question

HELP, CAN'T GET THIS WRONG HELP!!!!!!!!!!!!!!!!!!!!!!!!!

if the area of a circle measures 9π cm2, what is the circumference of the circle in terms of π? A) 3π cm B) 6π cm C) 9/4 π cm D) 9/2 π cm

Answer 1

The circumference is B. 6π because:
Radius = 3
Circumference = πd

d=diameter
radius=half of diameter
diameter=2 radius

3*2=6
6 * π=6π.

Hope this helped☺☺

Answer 2

A = π*r^2 . . . . . . . . . . . . formula for area
9 π cm^2 = π*r^2 . . . . . substitute the given information
9 cm^2 = r^2 . . . . . . . . divide by pi
3 cm = r . . . . . . . . . . . . . take the square root

C = 2π*r . . . . . . . . . . . . . formula for circumference
C = 2π(3 cm) . . . . . . . . substitute for r
C = 6π cm . . . . . . . . . . . matches selection B