Obtuse Angle
An angle that measures greater than 90 degrees but less than 180 degrees.
An obtuse angle is an angle that measures between 90 degrees and 180 degrees. In other words, it is an angle that is greater than a right angle (90 degrees), but less than a straight angle (180 degrees). To identify an obtuse angle, we can visually inspect the angle and see whether it appears to be wider than a right angle.
One way to measure an obtuse angle is to use a protractor. We can place the protractor on the vertex (the point where the two rays making up the angle meet) and align the baseline of the protractor with one of the sides of the angle. Then, we can read off the measurement from the protractor scale to determine the angle’s measure in degrees.
Examples of obtuse angles include a V-shape or an angle formed by the hands of a clock when they are pointing to the numbers 1 and 7. Contrary to acute angles (angles that measure less than 90 degrees) and right angles (angles that measure exactly 90 degrees), obtuse angles are not commonly used in everyday life and are often encountered in geometry and trigonometry.
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