In a circle of radius 5 cm, a chord is 8 cm long. How far is the chord from the centre?
Q1. In a circle of radius 5 cm, a chord is 8 cm long. How far is the chord from the centre?
Answer: 3 cm
Explanation: The perpendicular from the centre bisects the chord, leaving a 4 cm half-chord. By Pythagoras, the distance is square root of 25 minus 16, which is 3 cm.