Angle
If two lines meet at a point, then the angle between them is the amount of turn, in degrees, that is needed around the point of intersection, to make the lines the same.
Angles are measured in degrees, a complete whole turn is 360º as shown.
Different types of angles
Straight angle: It is onehalf of a whole turn, and is the same as the angle made by rays going in opposite directions. The measure of the angle is 180º. Some examples are shown below:
Right angle: It is onequarter of a whole turn and is the same as the angle made by a horizontal line and vertical line. The measure of the angle is 90º. Some examples are shown below:
Acute angles: The angles that lie between 0º and 90º are called acute. Some examples are shown below:
Obtuse angles: The angles that lie between 90º and 180º are called obtuse. Some examples are shown below:
Reflex angles: The angles that lie between a straight angle (180º) and a whole turn (360º) are called reflex angles. Some examples are shown below:
We see angles almost everywhere in our day to day life. For example, the angle made by the hands of a clock, the angle made by two intersecting roads, and angles made by blades of a fan. We also use angles for navigation of planes and ships.
Fun Facts
