Simple :) Area of shaded part = are of 1/4 circle - area of both triangles. Are of circle = pie r^2 so 100x3.14 = 314 cm2. Area of triangle AOB= area of triangleDOE = bh/2= 5x10/2= 25 each However, the traingles share a common area which is quad DOB(I) Lets take traingle AOE, whose are is bh/2=10x10/2=50cm2. 50-area of triangle A(I)E= 50-(
