At which point is the center of gravity situated in: (a) A triangular lamina and (b) A circular lamina?
At which point is the center of gravity situated in: (a) A triangular lamina and (b) A circular lamina?

(a) The centre of gravity of a triangular lamina is at the intersection of its medians.

(b) The center of gravity of a circular lamina is at the center of the circular lamina