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In the given figure A and B are centres ...

In the given figure A and B are centres of the circles. If `AR = a , RB = b` then which of the following is equal to `a-b`?

A

`( r_1^2 - r_2^2)/( sqrt( r_1^2 + r_2^2) )`

B

`(r_1^2 + r_2^2)/( sqrt( r_1^2 - r_2^2) )`

C

`(2r_1 r_2)/( sqrt( r_1^2 + r_2^2) )`

D

None of these

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The correct Answer is:
A
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LUCENT PUBLICATION-CIRCLE AND ITS TANGENT LINES-EXERCISE 8A
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  2. Two chords of a circle, of lengths 2a and 2b are mutually perpendicula...

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  3. In the given figure A and B are centres of the circles. If AR = a , RB...

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  4. A circle with radius r has a chord PQ whose length is 2a. The tangents...

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  5. In the figure given below what is the measure of angle BYX?

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  6. In the figure given below, radius OA is equal to chord AB. What is the...

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  7. From a point T which is 13 cm away from center O of a circle whose rad...

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  8. In the adjacent figure AD is a straight line. OP is perpendicular to A...

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  9. In the adjacent figure, a circle is inscribed in the quadrilateral ABC...

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  10. If the length of the three sides of a triangle are 6 cm, 8 cm and 10 c...

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  11. In the figure given below, what is the measure of angle CBA?

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  12. A,B,C and D are 4 points on the circumference of the circle and O is...

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  13. PQ is a common chord of two circles. APB is a secant line joining poin...

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  14. ABCD is a cyclic quadrilateral. The tangent at A and C meet at a point...

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  15. In the figure XY is a tangent to the circle with centre O at A. If ang...

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  16. In the figure given above, AP = 3 cm, PB = 5 cm, AQ = 2 cm and QC = x....

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  17. In the figure given above, PT is a tangent to a circle of radius 6 cm....

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  18. A point P moves such that its distances from two given points A and B...

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  19. In the given figure O is the centre of the circle. Line UTV is tangent...

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  20. In the figure, angle AOB = 46^(@), AC and OB intersect at right angle ...

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