Concentric Circles: The circle which have common centre point and different radius are called concentric circles.
Illustration: Two concentric circles are of radii 5 cm and 3 cm. Find the length of the chord of the larger circle which touches the smaller circle.
Solution: In the figure two concentric circles have their centre at O. The radius of larger circle is 5 cm and that of the smaller ciircle is of radius 3cm PR is a chord to the outer Circle PR touches the inner circle at Q, So PR is tangent to the inner circle [ tangent is perpendicular to radius ] OQ = 3cm [Radius of inner circle] and OP = 5cm [Radius of outer circle] Now POQ is a right angled at Q [ By pythagorous theorem] PQ = 4 cm PR is a chord to outer circle and as PR OQ, Therefore OQ bisects the chord PR = 2 X PQ = 2 X 4 = 8 cm |
The figure shows two concentric circles and AD is a chord of larger circle. If the length of AP = 10 cm and BP = 3cm. Find the value of 3CD + 2AP
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Right Option : A | |||
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The figure shows two concentric circles and AD is a chord of larger circle. If the length of AB = 3 cm. Find the value of CD.
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Right Option : B | |||
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The figure shows two concentric circles and AD is a chord of larger circle. If the length of AP = 10 cm and BP = 3cm. Find the value of CD.
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Right Option : D | |||
View Explanation |
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