Question

What is the angle name for half a revolution?

Answer 1

Hint- In this question use the concept of revolution that a revolution has ${360^0}$ or $2\pi $radians. Half of this revolution means half of ${360^0}$ or half of $2\pi $radians. Use this concept to obtain the angle and naming is done in accordance to the concept that which figure a line or a circle is correlated to this half angle obtained.

Complete step-by-step solution -

As we know in a complete revolution there is${360^0}$.
So in a half revolution there is $\dfrac{{{{360}^0}}}{2} = {180^0}$.
Now as we know ${180^0}$ only happens on a straight line.
So half a revolution is also called a straight angle.
So straight angle is the angle name for half a revolution.
So this is the required answer.

Note Whenever we face such types of problems the key concept is to have a basic understanding of the angles associated with basic figures like that for straight line it is ${180^0}$and for a circle it is${360^0}$. This will help in getting on the right track to get the answer.