Angles

**Category : **3rd Class

When a straight line stands upright (perpendicular) on another straight line a right angle is formed. In the given figure, a straight line AB stands upright on the another straight line BC thus the ABC is formed is called a right angle. The line AB stands upright on BC called perpendicular line to BC and represented by AB -L BC. A right angle is represented by a box as shown in the figure. The measurement of a right angle is always (90 degree). In the given figure

**Remember the following about a right angle:**

- A perpendicular line on another horizontal line forms a right angle.
- The unit for the measurement of an angle is degree (°).
- A right angle is always equal to 90°.
- A square box at the meeting point of two lines represents an angle of90°.
- A perpendicular line between two points is their shortest distance.

**Which one of the following options represents a right angle?**

(a)

(b)

(c)

(d) All of these

(e) None of these

**Answer (c) **

**Explanation:** A square box at the vertex represents the right angle.

**Acute Angle**

If the measurement of an angle is less than a right angle or 90° then it is called an acute angle. In the figure given below,is less inclined than the angle shown by a square box of right angle. Hence, is an acute angle.

**Obtuse Angle**

If the measurement of an angle is more than a right angle or but less than two right angles or then the angle is called an obtuse angle. In the given figure is an obtuse angle.

*play_arrow*Introduction*play_arrow*Point, Line and Ray*play_arrow*Angles*play_arrow*Triangles

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