CBSE Class 10-Mathematics: Questions and Answers Chapter –10 Circles Part 9
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Question 19:
If AB, AC and PQ are tangents in the given figure and , find the perimeter of .

Find the Perimeter
Answer:
Perimeter of
Question 20:
Find the locus of the center of circles which touch a given line at a given point.
Answer:
Let APB be the given line and let a circle with center O touch APB at P. Then , let there be another circle with center O’ which touches the line APB at P.
Thus,
Question 21:
In the given figure, find the perimeter of if .

BC Touches the Circle at R
Answer:
BC touches the circle at R
Tangents drawn from external point to the circle are equal.
And
Perimeter of
Question 22:
If PA and PB are tangents drawn from external point P such that and
Answer:
[O is centre of circle]
is equilateral triangle
Question 23:
If AB, AC and PQ are tangents in the given figure and , find the perimeter of .

Find the Perimeter
Answer:
Perimeter of