Question

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

Answer 1

U = π* (r + h ) [ : π


`(U)/( \pi ) = r + h \\ \\ r = (U)/( \pi ) - h \\ \\ r = (16,5)/( \pi ) - 2 \\ \\ r = (165)/(10) : (22)/(7) - 2 \\ \\ r = (33)/(2) * (7)/(22) - 2 \\ \\ r = (3)/(2) * (7)/(2) - 2 \\ \\ r = (21)/(4) - 2 = 5,25 - 2 = 3.25 Answer r = 3,25`

Answer 2

U=π(r+h)
r+h=U/π
r=U/π - h

Data:
U=16 1/2=16 + 1/2=(16*2+1)/2=33/2
h=2
π=22/7

Then:
r=U/π - h
r=(33/2)/(22/7) - 2
r=(33*7)/(2*22) - 2
r=231 /44 - 2
r=(231-2*44)/ 44
r=(231-88)/44
r=143/44 = (3*44 + 11)/44=3 11/44

Answer: r=143/44 or 3 11/44