Question

The number of right angles in a straight angle is ______ and in a complete angle is ________.

• A. 4, 2
• B. 2, 4
• C. 1, 2
• D. 2, 2

Answer 1

The correct option is B

2, 4

We know that,

a right angle = ${90}^{\circ }$

a straight angle = ${180}^{\circ }$

and a complete angle = ${360}^{\circ }$

$\therefore$ The number of right angles in a straight angle = $\frac{{180}^{\circ }}{{90}^{\circ }}$ = 2

Here, $\angle AOC$ and $\angle COB$ are right angles in a straight angle $\angle AOB$.

Now, the number of right angles in a complete angle = $\frac{{360}^{\circ }}{{90}^{\circ }}$ = 4

Here,$\angle AOC$,$\angle AOD$,$\angle COB$ and$\angle BOD$ are right angles in the complete angle $\angle O$.