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Vertical Angles 1 2 Isosceles Triangle B A Two angles opposite one another at the intersection of two lines. Two angles that are congruent. A triangle that has at least two congruent sides Base angles are congruent. A triangle that has all three sides congruent. All angles are congruent. A quadrilateral with two pairs of parallel sides. Opposite sides are congruent. A parallelogram with four right angles. Diagonals are congruent. A parallelogram with four congruent sides. Opposite angles are congruent. AB = BC C Equilateral Triangle F E D Parallelogram R FR GH F H GF HR G Rectangle M I IM JK IJ MK J Rhombus K M N O P Trapezoid A quadrilateral with exactly one pair of parallel sides. Q P S Sum of interior angles is 3600. PS QR R Alternate Interior Angles 1 Angles that are Their interiors do nonadjacent interior not intersect. angles on opposite sides of the transversal. 2 Complementary Angles 50 ° Two angles whose measures add up to 900. Must be acute. Two angles whose measures add up to 1800. At least one of the angles must be a non–acute angle. An angle of a polygon that is formed by a side and the extension of an adjacent side. Two at each vertex. 40 ° Supplementary Angles 135° 45° Exterior Angle 1 Convex Polygon A polygon such that Diagonals contain no side extended no points outside cuts any other side the polygon. or vertex. Perpendicular Lines Two lines that intersect to form a right angle. Form an angle equal to 900. Angle Bisectors A ray that divides an angle into two congruent angles. Angles have equal measure. Corresponding Angles A pair of angles in similar locations when two lines are intersected by a transversal. May be congruent. 1 2