acute angle - an angle that measures less than 90°, right angle - an angle (formed by perpendicular lines) that measures exactly 90°, obtuse angle - an angle that measures greater than 90°but less than 180°, Reflex angle - an angle that measures more than 180º but less than 360º, Revolution angle - Exactly 360º, Complementary angles - Sums up to 90 °, Supplementary angles - Sums up to 180º, Vertically opposite angles - Equal angles opposite each other when two lines intersect, Alternate angles, Co-interior angles, Corresponding angles, acute triangle - a triangle in which each of the three angles is acute (less than 90°), obtuse triangle - a triangle that has one obtuse angle (greater than 90°) and two acute angles, right triangle - a triangle with one right angle (exactly 90°) and two acute angles, equilateral triangle - a triangle in which all three sides are the same length, isoceles triangle - a triangle with 2 equal sides and 2 equal angles, scalene triangle - a triangle with no equal sides or equal angles,

10MBA Geometry Vocabulary

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