Acute Angle - An angle less than 90o, Acute Triangle - A triangle with all sides that are less than 90o, Circumference - Distance around something, Complementary Angles - Two angles with a sum of 90o, Congruent - Angles that are the same size, Equiangular Triangle - a triangle in which angles are congruent and all sides are of equal length, Equalteral Triangle - A triangle with all equal sides, Extirior Angle - Angles on the outside of the transversal, Isosceles Triangle - A triangle with exactly two equal sides, Obtuce Angle - An angle more than 90o, Obtuce Triangle - A triangle with all angles more than 90o, Parallelogram - A shape with all parallel sides, Quadrillateral - A shape with four sides, Ray - Half infinite line, Right Angle - A 90o angle, Right Triangle - A triangle with all 90o  angles, Scalene Triangle - A triangle with no equal sides, Similarity - When two shapes are similar, Transversal - A line that crosses at least two other lines, Trapezoid - A quadrillateral with two parallel sides, Vertical Angle - each of the pairs of opposite angles made by two intersecting lines.,

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