You normally use pie in equation that had the circumference or radius or diameter. !<span />
Answer: 3/2a3
I can't properly write the answer sorry but it's the last one.
Check the picture below.
you can pretty much just count the units off the grid.
the perimeter is the length of all sides summed up.
Step-by-step explanation:
28+29=57
57+42=99 so 99 should be your answer