From a point Q, the length of the tangent to a circle is 40 cm and the distance of Q from the centres is 41 cm. The radius of the circle is _______ cm.

From a point Q, the length of the tangent to a circle is 40 cm and the

1.	From a point Q, the length of the tangent to a circle is 40 cm and the distance of Q from the centres is 41 cm. The radius of the circle is _______ cm.
A.	9
B.	7
C.	8
D.	10
Answer» B. 7

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From a point Q, the length of the tangent to a circle is 40 cm and the distance of Q from the centres is 41 cm. The radius of the circle is _______ cm.

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