Question 131
The length of the tangent drawn to a circle of radius 4 cm from a point 5 cm away from the centre of the circle is
Solution
OA = 4 , OB = 5 cm
In right $$\triangle$$OAB
=> AB = $$\sqrt{(OB)^2 - (OA)^2}$$
=> AB = $$\sqrt{25-16} = \sqrt{9}$$
=> AB = 3 cm
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