Chords ac and bd intersect at the center of circle abcd. which is the measure of the minor arc ab? a) 20 b) 45 c) 60 d) 75

What is the difference between regular convex and concave polygons

What does x = in this equation x+3+2x=x+5

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).