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4. Circle O is shown below. The diagram is not drawn to scale.

4. Circle O is shown below. The diagram is not drawn to scale.-example-1

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\qquad\qquad\huge\underline{{\sf Answer}}

Concept : As we know, Angle made by an arc on the centre of the circle is double the angle made by the same arc on the part of circle.

Therefore, we can infer that :


\qquad \sf  \dashrightarrow \:\angle O= 2 × \angle R


\qquad \sf  \dashrightarrow \:\measuredangle O= 2 × 28 \degree


\qquad \sf  \dashrightarrow \:\measuredangle O= 56 \degree

I hope that helps ~

User Manus Gallagher
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