Question

find the total surface area of a cone,if its slant height is 21m and diameter of its base is 24 m.

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Answer 1

So given l=21m

rad=24/2 = 12m

So , h²=l²-b²

or h²= 21²-12²

h²=441-144

h²=293

or h= 17.23m

How TSA= πr(r+l)

or 22/7× 12 × 33

or TSA= 1244.57m² (Ans)

Answer 2

Answer:

you apply surface area formula = pai r( r+l)

Step-by-step explanation:

the we have find surface area=1244.57 m2