## Acute Angles in Detail

1. What are the Five Types of Angles?

Ans. The five types of angles are acute angle (< 90°), obtuse angle (> 90°), right angle (= 90°), straight angle (= 180°), reflex angle (> 180°). There is another angle which measures 360° and is called full rotation of the axis.

2. Can a Triangle Have Only One Acute Angle?

Ans: No, a triangle cannot have only one acute angle. If a triangle has 1 obtuse angle, the other two angles will have to be either right angles or obtuse angles. It is not possible as the summations of interior angles of a triangle are always 180°. So, every triangle requires at least 2 acute angles.

3. How Can You Measure Angles?

Ans: Angles can be measured by using a protractor. First, we need to place the center of the protractor at a fixed point. We can consider one arm of an angle as the base. When we measure from the base of the angle in an anti-clockwise manner till the other arm, we will get the degree of the angle.