Question

The total surface area of a cone of base radius and slant height 2l is ______.

Options

• 2πr (l + r)

• `πr(l + r/2)`

• `πr(l + r/4)`

• `πr(l + r)`

Answer 1

The total surface area of a cone of base radius and slant height 2l is `bbunderline(πr(l + r/4))`.

Explanation:

The total surface area of a cone is the sum of its curved surface area, πrl, and its circular base area, πr². Factoring out the common terms gives the standard textbook formula: TSA = πr(l + r).