Show that l = √2r2(1 − cos θ), where r is radius, angle θ and l as length of chord of a circle.

Show that l = √2r2(1 − cos θ), where r is radius, angle θ and l as length of chord of a circle.

Complete question: Show that for a circle of radius r the length of a chord l that subtends an angle θ at the centre of the circle is given by l = √2r2(1 − cos θ). Visit https://www.cherishmath.com