In a circle with centre O, a 6 cm long chord is at a distance 4 cm from the centre. Find the length of the diameter.
Answer & explanation
Correct answer: option 4
We know that,
Pythagoras theorem:
h2 = b2 + p2
r2 = 42 + 32
r = 5
The diameter of the circle = 2 × 5 = 10 cm