Multiple choice

The length of a tangent drawn from a point 10 cm. away from the centre of a circle is 8 cm. Find the perimeter of the circle. एक वृत्त से 10 सेमी. दूर स्थित एक बिन्दु से खींची गयी स्पर्श रेखा की लम्बाई 8 सेमी. है। वृत्त का परिमाप ज्ञात कीजिए।

  1. 4π

  2. 12π

  3. 6π

  4. 128π
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the tangent-radius theorem, the tangent is perpendicular to the radius at the point of contact, forming a right triangle. By Pythagoras theorem: radius = sqrt(10^2 - 8^2) = 6 cm. Perimeter = 2πr = 12π.

Keep practicing — related questions