BASIC CONCEPTS OF GEOMETRYGeometryAcute Angle - angle with a ray separated by less than 90°.Figure 5 Acute AngleObtuse Angle - angle with a ray rotated greater than 90° but less than 180°.Figure 6 Obtuse AngleReflex Angle - angle with a ray rotated greater than 180°.Figure 7 Reflex AngleMA-03 Page 4 Rev. 0