The length of tangent from a point A at a distance of 5 cm from the centre of the circle is 4 cm. What is the radius of the circle?
Let us first draw whatever is given for a better understanding of the problem.
Let O be the center of the circle and B be the point of contact.
We know that the radius of the circle will be perpendicular to the tangent at the point of contact. Therefore, we have as a right triangle and we have to apply Pythagoras theorem to find the radius of the triangle.
Therefore, radius of the circle is 3 cm.
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