Multiple choice

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.

  1. 10 cm

  2. 5 cm

  3. 15 cm

  4. 20 cm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the chord-center theorem: radius² = (half chord)² + (distance from center)². Half chord = 3 cm, distance = 4 cm. So r² = 3² + 4² = 9 + 16 = 25, giving r = 5 cm. Diameter = 2r = 10 cm. Option A is correct.

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