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In Fig. 10.99, D E and D F are tan...

In Fig. 10.99, `D E` and `D F` are tangents from an external point `D` to a circle with centre `A` . If `D E=5c m` and `D E_|_D F` , then the radius of the circle is (FIGURE) (a) 3cm (b) 5cm (c) 4cm (d) 6cm

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In figure, DE and DF are tangents from an external point D to a circle with centre A. If DE = 5 cm and DE_|_DF , then find the radius of the circle.

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RD SHARMA-CIRCLES-All Questions
  1. If P T is tangent drawn from a point P to a circle touching it a...

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  2. In the adjacent figure, if A B=12 c m ,\ \ B C=8c m and A C=10 c m ...

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  3. In Fig. 10.83, if A P=P B , then (FIGURE) A C=A B (b) A C=B C (c) A...

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  4. In Fig. 10.84, if A P=10 c m , then B P= (FIGURE) sqrt(91)c m (b) s...

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  5. In Fig. 10.86, if quadrilateral P Q R S circumscribes a circle, ...

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  6. In Fig. 10.87, two equal circles touch each other at T , if Q P=4. ...

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  7. In Fig. 10.88, A P B is a tangent to a circle with centre O at p...

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  8. In Fig. 10.90, P R= (FIGURE) (a) 20cm (b) 26cm (c) 24cm (d) 28cm

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  9. In Fig. 10.93, there are two concentric circles with centre O . P R...

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  10. In Fig. 10.94, if A B=8c m and P E=3c m , then A E= (FIGURE) (a) ...

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  11. In Fig. 10.95, P Q and P R are tangents drawn from P to a circle...

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  12. In Fig. 10.96, if T P and T Q are tangents drawn from an externa...

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  13. In Fig. 10.97, the sides A B ,\ B C and C A of triangle A B C , ...

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  14. In Fig. 10.98, a circle touches the side D F of E D F at H and tou...

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  15. In Fig. 10.99, D E and D F are tangents from an external point D...

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  16. In a right triangle A B C , right angled at B ,\ B C=12 c m and ...

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  17. Two circles touch each other externally at P . A B is a common t...

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  18. In Fig. 10.101, P Q and P R are two tangents to a circle with ce...

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  19. In Fig. 10.102, Q R is a common tangent to the given circles touchi...

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  20. In Fig. 10.103, a quadrilateral A B C D is drawn to circumscribe...

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