Question

If U=pi(r+h),find r when U=16 1/2 and h=2
solve this question by take the value of pi 22/7

Answer 1

`U=\pi (r+h) \\\\ 16 (1)/(2)= (22)/(7)\cdot (r+2) \\\\ (33)/(2) : (22)/(7)=r+2 \\\\ (\\ot 33)/(2)\cdot (7)/(\\ot 22)=r+2 \\\\ (3)/(2) \cdot (7)/(2)=r+2 \\\\ (21)/(4)=r^((4)+2^((4) \\\\ 21=4r+8 \\\\ 4r=21-8 \\\\ 4r=13 \\\\ \boxed{r=(13)/(4)}`