Answer:
there is no picture so I dont know what i have to do..
2(l+w)=P
72 x 2= 144
240 - 144= 96
96/2= 48
your answer would be 48in.
<u>check
</u>2(72+48)= 240
144+96= 240
240=240
Assuming the h is not in the exponent, R would equal The square root of V over 3.14h
Answer is option 4. working out attached
hope it helps :)