self Maths Puzzle

The slant height of a right circular cone is 10 m and its height is 8 m. Find the area of its curved surface.

A. 30 m2 B. 40 m2
C. 60 m2 D. 80 m2

Read Solution (Total 1)

l = 10 m,

h = 8 m.

So, r = l2 - h2 = (10)2 - 82 = 6 m.

Curved surface area = rl = ( x 6 x 10) m2 = 60 m2
8 years agoHelpfull: Yes(0) No(0)

self Other Question

50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is 4 m3, then the rise in the water level in the tank will be:

A. 20 cm B. 25 cm
C. 35 cm D. 50 cm
A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:

A. 49 m2 B. 50 m2
C. 53.5 m2 D. 55 m2