Question

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

Answer 1

`\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 ~