Question

7. A solid cylinder is of height 15 cm and diameter 7 cm. Two equal conical holes ofradius 3 cm and height 4 cm are cut off, one from each circular end. Find the surface area of the remaining solid

Answer 1

it's simple ... see total surface area= curved surface area of cylinder + 2x curved surface area of one cone for cylinder it is 15 and for cone it will be 5. Formula :- for cylinnder = 2pie rh, for cone = pie r height