While measuring through a protractor the measure is usually in degrees. The measurements in both the edges total up to 180°. When we look at a protractor we can see measurements from 0 to 180 from left to right at the outer edge and 180 to 0 from right to left on the inner edge. A protractor is considered one of the most important geometric tools as it helps in measuring angles in both degrees and radians. While a protractor can be used for both constructing and measuring, a compass is mostly used for constructing an angle. For example, while measuring in the revolution we can say a right angle is a quarter of a circle while in degrees an angle is read as a right angle is 90°.Īn angle is measured by using two geometric tools - a protractor and a compass. Along degrees, the revolution also is the unit of 360° as an angle is basically a subdivision of a circle rather than the sum of a few degrees. Revolution is the simplest form of measuring angles. Half a circle is 180° which is π radian and one complete revolution is 2π radian. Radian is denoted as rad or c and is written as 1.7 radians or 1.7 rad or 1.7 c. In other words, a radian is an angle subtended by the arc of the length of the radius of the same circle at the center and the ratio will give the radian measure of the angle. By definition, a radian is the ratio of the length of the arc that the angle subtends of a circle, divided by the length of the radius of the same circle. Radian is another unit of measurement of an angle and is used in place of degrees when the angle needs to be measured in terms of radians. And is read as 30 degrees, 45 degrees, 90 degrees, etc. The different angles with different degrees are 30°, 45°, 90°, and so on. A circle completely rotates at a 360° and a degree is a part of that 360° rotation as it is divided into 360 equal parts. Degreesĭegree is the unit of measure of an angle and is measured by using the geometric tool - a protractor. Let us see what these three ways of measuring angles are. Measuring angles is done in three ways - degrees, radians, and revolution. A protractor helps in providing the exact measure of the angle and a compass helps in constructing the angle. These tools help in finding the exact measure of an angle. Measuring angles is done by using basic geometric tools like a protractor and a compass.
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