A tangent AB is drawn from an exterior point A that touches the circle at point B. Another line AD is drawn from A, which intersects the circle at points C and D, such that CD = 5 cm. If the sum of the lengths of tangent AB and line AD is 15 cm, then find the length of the line AD.

A tangent AB is drawn from an exterior point A that touches the circle

1.	A tangent AB is drawn from an exterior point A that touches the circle at point B. Another line AD is drawn from A, which intersects the circle at points C and D, such that CD = 5 cm. If the sum of the lengths of tangent AB and line AD is 15 cm, then find the length of the line AD.
A.	8 cm
B.	9 cm
C.	10 cm
D.	11 cm
Answer» C. 10 cm

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A tangent AB is drawn from an exterior point A that touches the circle at point B. Another line AD is drawn from A, which intersects the circle at points C and D, such that CD = 5 cm. If the sum of the lengths of tangent AB and line AD is 15 cm, then find the length of the line AD.

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