Multiple choice

In a circle the angle between a radius and a tangent at non-centre end of the radius is

  1. $90^o$
  2. $180^o$
  3. $45^o$
  4. $360^o$
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A Correct answer
Explanation

By geometric theorem, the tangent to a circle at any point is perpendicular to the radius through the point of contact.

AI explanation

By the tangent-radius theorem, the radius of a circle drawn to the point of contact of a tangent is always perpendicular to that tangent. Therefore, the angle formed between the radius and the tangent at the point of contact is exactly 90 degrees.

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