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the length of the tangent drawn from a point 8cm. away from the centre of a circle of radius 6cm. is ?

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2root7. right angled triangle is formed
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two circles touch each other externally at C and AB is a common tangent to the circles. then angle ACB = ? if a wire is bent into the shape of a square , then the area of the square is 81cm square. when wire is bent into a semi circular shape, then the area of the semi-circle will be ?