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