Find the exact circumference

Question

Find the exact circumference and area of the circle 

The radius is 11cm find the exact circumference in cm and the area in sq cm

Answer 1

Hi Theresa,

 

Circumference =  2*pi*r and area = pi*r*r.

 

So, the circumference would be 2*pi*11cm = 22pi cm.

 

Furthermore, the area would be pi*11cm*11cm = 121pi cm²

 

Hope this helps.

Answer 2

What you know:  radius   r = 11 cm

 

Formulas you need:  Circumference of a circle.    C = 2πr

                               Area of a circle.     A = πr²

 

 Substitute r = 11 cm into your formulas and solve.