Question

0.n.8. If the sum of radius and height of cylinder is 21 cm and curved surface area is 616cm² , find the total surface area of the cylinder.
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Answer 1

Answer:

answer is 474.2 cm^2

Step-by-step explanation:

r+h=21cm

total surface area=616 cm^2

total surface area=2πr(r+h)

616= 2x22/7r(r+h)

616=44/7r(21)

616x7/44=21r

4312/44=21r

98/21=r

r=4.6cm

r+h=21

4.6+h=21

h=21-4.6