Question

FIND THE TOTAL SURFACE AREA OF A CONE, IF ITS SLANT HEIGHT IS 21 M AND DIAMETER OF ITS BASE IS 24 M
(Hint: the answer is not 124.57)​

Answer 1

Diameter of base of the cone = 24m

so the radius will be = 12m

The slant height of the cone = 21m

We know that,

                        T.S.A. of a cone = $\pi r(l+r)$

                                                    22 * 12 ( 21 + 12 )

                                                     7

                                                     = 1244.57143