Question

A cylinder is closed at both the ends by 28 cm high cones.the radius and height of the cylinder are 21 cm and 50 cm respectively.find the total surface of the object​

Answer 1

Answer:

here radius is common for both cylinder and cone

Step-by-step explanation:

CONE:

r =21

h= 28

l= √(21²+28²)

= 35

tsa = πrl

= 21 ×35 π

= 735π

CYLINDER:

r= 21

h= 50

csa= 2πrh

= 2π×21 ×50

= 2100π

so, total area of the object will be 2(tsa of cone ) + csa of cylinder

= 735π + 2100π

= 2835π

hope it helps you