Two concentric circles are of radii 5cm and 3cm are drawn find the length of the chord of the larger circle which touches smaller circle construction steps
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Let the two concentric circles be centered at point O. And let PQ be the chord of the larger circle which touches the smaller circle at point A. Therefore, PQ is tangent to the smaller circle.
OA ⊥ PQ (As OA is the radius of the circle)
Applying Pythagoras theorem in ΔOAP, we obtain
OA2 + AP2 = OP2
32 + AP2 = 52
9 + AP2 = 25
AP2 = 16
AP = 4
In ΔOPQ,
Since OA ⊥ PQ,
AP = AQ (Perpendicular from the center of the circle bisects the chord)
PQ = 2AP = 2 × 4 = 8
Therefore, the length of the chord of the larger circle is 8 cm.
OA ⊥ PQ (As OA is the radius of the circle)
Applying Pythagoras theorem in ΔOAP, we obtain
OA2 + AP2 = OP2
32 + AP2 = 52
9 + AP2 = 25
AP2 = 16
AP = 4
In ΔOPQ,
Since OA ⊥ PQ,
AP = AQ (Perpendicular from the center of the circle bisects the chord)
PQ = 2AP = 2 × 4 = 8
Therefore, the length of the chord of the larger circle is 8 cm.
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