PQ and RS are 2 parallel chords of a circle such that PQ = 8 cm & RS = 6 cm. If the chords are on the opposite sides of the centre and distance between them is 4 cm. find the radius of the circle

Answer 1

r^2-x^2 = 4^2
r^2-(4-x)^2 = 3^2

now just solve for r