Question

Find the area of the circle with the given radius or diameter. Use = 3.14.

d = 13

Answer 1

r=d/2
so r=6.5
A=pi*r^2
A=132.665

Answer 2

How difficult can this be, really? Memorize the following formulas and u will save yourself a lot of energy not to mention time that you could put to better use.

Area of Circle is
\[\pi r^2\]
Circumference of Circle is
\[2\pi r\]

"Exact" means leave the answer in terms of pi.