Question

what is the formula to find hollow cylinder area

Answer 1

the formula to find the surface area of hollow cylinder is

2×pi×radius×height of cylinder
also called

2×pi×r×h.

Answer 2

Curved Surface area of hollow cylinder = $2 \pi rh$ + $2 \pi Rh$

Total Surface area = $2 \pi rh + 2 \pi Rh + 2 \pi ( R^{2} - r^{2} )$


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