Question

what is area of holo cylinder ?

Answer 1

formula For s.a of hollow Cylinder is 2π ( r1 + r2 )( r2 - r1 +h), where, r1 is inner radius, r2 is outer radius and h is height.

Answer 2

Answer:

L=2πr1h+2πr2h

Step-by-step explanation:

Let ‘r1‘ be the outer radius of the given cylinder and ‘r2‘ be its inner radius and ‘h‘ be its height.

‘C1‘ be the outer circumference and ‘C2‘ be the inner circumference.

L1 and L2 be the outer and inner surface areas respectively.

h be the height (or length) of a cylinder

Area of Hollow Cylinder formulas:

The Circumference of a tcircle (C) is given by:

C=2πr, therefore,C1=2πr1 C2=2πr2

The Lateral Surface Area (L),for a cylinder is:

L=C×h=2πrh, therefore,

L1=2πr1h, the external curved surface area

L2=2πr2h, the internal curved surface area

Thus Lateral Surface Area of a hollow cylinder = L=2πr1h+2πr2h