Solve for h such that 25% of the circle’s area is shaded.

Two congruent circles of radius 5 cm are drawn in such a way that one is 1 cm below the other . Find the area of red coloured region?

Seven circles, each with radius 1, overlap to form the composite figure shown below. Find the area of shaded region?

7 non-overlapping unit circles are inscribed inside a large circle as shown below. Find the area of the shaded region?

Three non-concentric circles of equal radii are drawn such that each circle touches the other two externally. The centres are joined to form a triangle whose area is 17320.5 cm^2. Find the area of the triangle not included in the circles.

Given that D, E, F are the midpoints of the opposite sites in the triangle ABC, find the area of the shaded region?