Mathematics
The length of the tangent drawn to a circle of radius 8 cm, from a point which is at a distance of 10 cm from the centre of the circle is :
6 cm
7 cm
9 cm
2 cm
Circles
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Answer
We know that,
The tangent at any point of a circle and the radius through this point are perpendicular to each other.
In right ∆OTP, we have
OT2 = PT2 + OP2
PT2 = OT2 - OP2
PT2 = 100 - 64
PT2 = 36
PT = = 6 cm.
Hence, option 1 is the correct option.
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