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Multiple choice

AB is tangent to the circle with centre O at A and $OA=AB$ Find $\angle OAB$.

  1. $30^{\circ}$
  2. $45^{\circ}$
  3. $60^{\circ}$
  4. $90^{\circ}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A tangent to a circle is perpendicular to the radius at the point of contact. Therefore, the angle OAB is 90 degrees.

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