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
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.
