The height of a cylinder is 20 cm and it's total surface is 1188 cm2 find its radius?
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tsa of cylinder=1188
2πr(r+h)=1188
r(r+h)=1188÷2×7÷22
r(r+20)=189
r²+20r-189=0
(r+27)(r-7)=0
if r+27=0
r=-27
if r-7=0
r=7
radius can't be negative
so r=7=radius
PLEASE SELECT MY ANSWERS AS BRAINLIEST
2πr(r+h)=1188
r(r+h)=1188÷2×7÷22
r(r+20)=189
r²+20r-189=0
(r+27)(r-7)=0
if r+27=0
r=-27
if r-7=0
r=7
radius can't be negative
so r=7=radius
PLEASE SELECT MY ANSWERS AS BRAINLIEST
Answered by
0
hi friend!
here is your answer.
The radius of the given cylinder is 7cm.
hope this helps!!!
here is your answer.
The radius of the given cylinder is 7cm.
hope this helps!!!
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