Question

Four times the area of the curved surface of a cylinder is equal to 6 time the sum of the area of its bases if its height is 12 cm find the is curved surface area

Answer 1

According to the question-
4{2πrh}=6{πr×r}
2πrh÷πr×r=6÷4
2h÷r=3÷2
2×12÷r=3÷2
24×2÷3= r
r=8×2=16m

Now, curved surface area of cylinder=2πrh
=2×22÷7×12 ×16
=8448÷7
=1206.85m×m