Geometrymedium · Past Paper
In a circle with center O, chord AB = 8 cm and the perpendicular distance from O to AB is 3 cm. Find the radius of the circle.
A4 cm
B5 cm
C6 cm
D10 cm
✓ Correct Answer: B — 5 cm
The perpendicular bisects the chord (4cm). Using Pythagoras: r^2 = 3^2 + 4^2 = 9 + 16 = 25, so r = 5 cm.
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