Question

2. Find the total surface area of a cone, if its slant height is 9 m and the radius of its base is 12m​

Answer 1

Answer:

792 m square

Step-by-step explanation:

Total surface area of a cone =πr(r + l)  

Hence, TSA of this cone, =  22/7 ×12×(12+9)

                                           = 792 m square

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Answer 2

Step-by-step explanation:

Slant height ( L ) = 9m

radius = 12m

T.S.A of cone = πr(L+R)

= 22÷7 ×12 ( 12+9 )

= 22÷7 × 12 × 21

=. 22×12×3

= 792m2