A circle of diameter 26 cm has two equal parallel chords of length 10 cm each, then the distance between the two chords is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 24 cm.
According to the given question,
Let the radius of the circle be r and the centre of the circle be O.
Given that, AB = CD = 10 cm
And diameter = 26 cm
Then, radius, r = 13 cm
In triangle DOM, using Pythagoras theorem,
MO2 + DM2 = OD2
⇒ MO2 + 52 = 132
⇒ MO2 = 169 - 25
⇒ MO = 12 cm
Again in triangle BON, using Pythagoras theorem,
NO2 + BN2 = OB2
⇒ NO2 + 52 = 132
⇒ NO = 12 cm
So, distance between the two chords = MO + NO
⇒ 12 + 12 = 24 cm
Hence the distance between the two chords is 24 cm.