Question

Triangle def with the given measurements is rotated in space about side de. which answer gives the solid formed and its surface area?pyramid with surface area a = 1212 • pbase • l triangle with surface area a = 1212 • r • h cone with surface area a = π • r • l π • r2 cone with surface area a = π • r • h

Answer 1

Cone with surface area A = π • R • L + π • R2 is the right answer

Answer 2

The rotation of a triangle will form a cone. The surface area of a cone is calculated through the equation,
SA (cone) = πrl + πr²
Hence, for this item the best answer would be cone with surface area a = π.r.l + π.r2, the third choice.