Given:
radius of the base of the cone =56cm
We know that curve d surface area of a cone=πrl.
Given that curved surface area of a cone=12320.
πrl=12320
22/7∗56∗l=12320
22∗8∗l=12320
176∗l=12320
l= 12320/176 = 70
We know that height of the cone,
h=√12 - r²
= √702-562
= 4900-3136
= √1764
=42.
Therefore the height of the cone = 42m.