Step 1: Align the protractor with the ray OB as shown below.
Angles on a protractor how to#
Let us learn how to measure this angle using the protractor. Doesn't it look like an acute angle? This means that its measure is greater than 0° and less than 90°. Let us try and see if we can find out what type of angle is ∠AOB. Observe the figure given below which shows ∠AOB. When the measurement of an angle is equal to 360° it is a complete angle. Reflex AngleĪ reflex angle is an angle whose measure is greater than 180° but less than 360°. Since the measure of a straight angle is 180°, it is one-half of the whole turn of a circle. Two right angles make up a straight angle. At a straight angle, the two rays are opposite to each other. In other words, a straight angle is a straight line, and the angle formed between two rays is equal to 180°. The angle formed by a straight line is called a straight angle. When an angle measures greater than 90° but less than 180°, it is an obtuse angle. A right angle can be easily observed as it forms the shape of the letter L. When an angle measures 90°, it is known as a right angle. Acute AngleĪn acute angle is an angle which is greater than 0° and less than 90°. Let us read about each type of angle individually along with their properties. Each type of angle has a unique identification on the basis of angle measurement. It has degrees marked clockwise from 0° to 180° in the outer scale and anti-clockwise from 0° to 180° in the inner scale.
It is a translucent tool that helps us measure angles in degrees. A protractor is a measuring instrument that is in the shape of a semi-circle. The best way to measure an angle is by using a protractor.
Angles on a protractor full#
One full rotation around a point forms a complete angle of 360°.
Observe the figure in which the vertex O is marked as the joining point of the two arms.Īn angle is measured in degrees. Vertex is a common endpoint that is shared by the two rays. Observe the figure given below which shows that OA and OB are the arms of the angle AOB. The two rays which join at a common point to form the angle are called the arms of the angle. There are two main parts related to an angle - the arms and the vertex. Let us read about the different parts of an angle. These rays are called the sides or arms of the angle. In geometry, an angle is formed when two rays are joined at their endpoints.
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