Find the length of the tangent drawn from a point 10 cm away from the centre of a circle of radius 8 cm
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By pythagoras theorem
AB^2 + BC^2 = AC^2
AB^2 + 64 = 100
AB^2 = 100 - 64
AB^2 = 36
AB = 6
Thus the length of the tangent is 6cm
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