An angle is formed by two rays or line segments that intersect.
There are several types of angles, classified according to their angle measurements.
|
Interior angle of a polygon: formed when two sides of the polygon meet. Exterior angle of a polygon: formed by extending one of the sides of the polygon.  |
|
|---|---|
|
Acute angle |
Right angle |
|
Obtuse angle |
 Straight angle (180°) |
|
Reflex angle |
Complete angle |
|
Zero angle |
|
These angles can be seen in many of the objects surrounding us.
The clock’s hands point to 3:15 a.m. and form a zero angle (0o).
Several geometric figures are defined by the fact that they contain a right angle.
The clock’s hands can form an obtuse angle, just like the sides of some shapes.
Vertical or horizontal lines contain straight angles.
