Understanding Obtuse Angles | Definition, Visualization, and Measurement

obtuse angle

An obtuse angle is an angle that measures greater than 90 degrees and less than 180 degrees

An obtuse angle is an angle that measures greater than 90 degrees and less than 180 degrees. In other words, it is an angle that is wider or “more open” than a right angle (90 degrees) but not as wide as a straight angle (180 degrees).

To visualize an obtuse angle, imagine a clock face where the right angle is at 3 o’clock. An obtuse angle could be any angle greater than 90 degrees but less than 180 degrees, such as an angle at 4 o’clock or 5 o’clock.

Obtuse angles are characterized by their openness and they appear wider than a right angle. They are often found in everyday objects and shapes, such as the angles in a kite or the angles formed by a rectangle that is not a square.

When measuring an angle, it is important to consider the vertex (the point where the two rays of the angle meet) and the direction in which the angle is measured. The size of an obtuse angle is always greater than a right angle, but smaller than a straight angle.

To measure an obtuse angle accurately, you would use a protractor. Place the center of the protractor on the vertex of the angle, align one of the protractor’s rays with one of the rays of the angle, and read the degree measure where the other ray intersects the protractor’s scale.

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