4/5×3/4×1/2= what does this problem equal

Guys i really need or i have to stay late up night

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Plz ( true - false) all triangles have interior angles whose measure sum to 90.