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The total surface area of frustum shaped...

The total surface area of frustum shaped glass tumbler is `(r_1 gt r_2)` `
` (a) `pi r_1 l + pi r_2 l` `
` (b) `pi l (r_1 + r_2) + pi (r_2)^2` `
` (c) `1/3 pi h ( (r_1)^2 + (r_2)^2 + r_1r_2 )` `
` (d) `sqrt (h^2 + (r_1 - r_2)^2)`

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