Angles in Geometry: Acute, Obtuse, Straight and Right

Angles form when two lines meet. when two straight lines meet at a common end point, they form an angle.

How to measure an angle?

An angle is measured in degrees. Any angle can be measured with a geometric tool called Protractor. It is shaped as a semi-circle and has a measure of 180 degrees. The mid-point of a protractor’s horizontal line, called the central point, measures an angle.

Types of Angles

Right angle

When two straight lines are perpendicular to each other or make 90 degrees with each other, they are said to be at right angle. Right angles are often shown as a bx in the corner of the turn of an angle. Thus the right angle is exactly 90 degrees.

Acute angle

When two straight lines make an angle which is greater than zero degrees but less than 90 degrees, then the angle formed is called an Acute angle. Also known as interior angles, acute angles are the smallest of all angles. Triangles usually have acute angles.

Obtuse angle

When two straight lines form an angle that is greater than 90 degrees, then the angle formed is called an Obtuse angle. These angles are known as the largest angles and often found in shapes like pentagons, octagons, and triangles.

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