1. Obtuse Angle (see image 1). Obtuse angles are angles that are more than 90° in measurement but less than 180°
2. Right Angle (see image 2). Right angles are angles that have the measurement of 90°, and is formed by an intersection of two perpendicular straight lines.
3. Acute Angle (see image 3). Acute angles are angles that are less than 90° in measurement.
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