Calculate total surface area of a cone with a radius of 6 and a slanted height of 13

Hey there!

Let the radius and slant height of the cone be r and l.

We know that;

Here,

Substituting values;

➵ 3.14 × 6 (6 + 13)

➵ 18.84 × (19)

Henceforth;

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i think the answer is b)

step-by-step explanation:

square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743