Question

Taylor is making a cookie cake that has a diameter of 13 in. What is the area of one-half of the cookie cake?
66.37
265.46
65.73
48.4

Answer 1

Try: http://www.mathopenref.com/circlearea.html
You know the diameter, but you could divide by 2 to get the radius. Then use the formula. You will need a calculator to get the answer since they have given approximations to the area.

Answer 2

\[\frac{1}{2} \pi \left(\frac{13}{2}\right)^2=\frac{169 \pi }{8}=66.37 \]

Answer 3

first find the area of your circle using the formula
\[\pi*r^2\] then multiply by 1/2 to find the area of half the circle