The cost of painting the total surface of a closed cylinder at Rs 5 per sq cm is Rs 4620 . If the height of the cylinder is 2 times the radius ,the radius is
a)7cm
b)14cm
c)21cm
d)28cm
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Answered by
1
Answer:
7
Step-by-step explanation:
Total surface area of Cylinder = 2πr(r+h)
we know that height = 2*r
so area will be 2πr(3r) = 6πr^2
Area covered in painting = 4620/5 = 924
that means 6πr^2 = 924
πr^2 = 154
r^2 = 49
r = 7
Answered by
1
Answer:
Your answers is 7cm
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