CBSE Class 10-Mathematics: Questions and Answers Chapter – 10 Circles Part 13

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Question 3:

Two tangents TP and TQ are drawn from an external point T with center O as shown in figure. If they are inclined to each other at an angle of, then what is the value of

TP and TQ are Tangents — TP and TQ Are Tangents

Answer:

and TQ are tangents and O is the center of the circle

Question 4:

Two concentric circles are of radii and , find the length of the chord of the larger circle which touches the smaller circle.

Answer:

is the chord of the larger circle which touches the smaller circle at the point L. Since is tangent at the point L to the smaller circle with centre .

is a chord of the bigger circle and

Chord

Length of chord

Question 5:

A quadrilateral ABCD is drawn to circumscribe a circle. Prove that .

Prove that AB+CD=AD+BC — Prove That AB+CD=AD+BC

Answer:

AP, AS are tangents from a point A (Outside the circle) to the circle.

Similarly,

Now

Question 6:

PQ is a chord of length of a circle of radius . The tangents at P and Q intersect at point T. Find the length TP.

Answer:

Join OT.

[tangents from T upon the circle]

And bisects PQ

Now