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  • From an external point Q, the length of the tangent to a circle is 5 cm and the distance of Q from the centre is 8 cm. The radius of the circle is Option: 1 39 cm Option: 2 3 cm Option: 3</

From an external point Q, the length of the tangent to a circle is 5 cm and the distance of Q from the centre is 8 cm. The radius of the circle is
Option: 1 39 cm
Option: 2 3 cm
Option: 3 \sqrt{39\: cm}
Option: 4 7 cm

Answers (1)

Tangents are perpendicular to the radius of the circle.

$Radius$ = \sqrt{8^2-5^2} = \sqrt{39} \ cm

 

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Safeer PP

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