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Question

Let a circle has a radius of 5 cm and XY be its chord of length 6 cm.Find the distance of the chord from the center of the circle? (in cm)

A
3
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B
4
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C
5
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D
7
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Solution

The correct option is B 4
We know that, the perpendicular from the center of a circle to a chord bisects the chord.

XZ=3 (OZXY)
Using pythagorean theorem in OXZ
OZ2+ZX2=OX2OZ2+32=52OZ2=16OZ=4
Hence, the distance of the chord from the center of the circle is 4 cm.

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