If any angle covers exactly half circle on a circular protractor, then it is an example of angle.

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Solution

Full circle in circular protractor is equal to $360^{\circ} .$
$∴$ Half circle is equal to $\frac{360^{\circ}}{2} = 180^{\circ},$ which is a straight angle.

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If any angle covers exactly half circle on a circular protractor, then it is an example of angle.

Full circle in circular protractor is equal to 360∘. ∴ Half circle is equal to 360∘2=180∘, which is a straight angle.

Full circle in circular protractor is equal to $360^{\circ} .$
$∴$ Half circle is equal to $\frac{360^{\circ}}{2} = 180^{\circ},$ which is a straight angle.