Compléter Geometry FinalVersion en ligne Geometry Final par Natalia Elizabeth Euceda Figueroa 1 A straight line perpendicular to one of two parallel lines is to the other also Lines perpendicular to non - parallel lines are If two angles have their sides parallel , right side to left side and left side to right side , the angles are If two angles have their sides perpendicular , right side to right side and left side to left side , the angles are An exterior angle of a triangle is ( greater than , equal to , less than ) the sum of the two opposite interior angles In any right triangle , the two acute angles are Each angle of an equilateral triangle is If two parallel lines are cut by a transversal , the sum of the two interior angles on the same side of the transversal is equal to The sum of the angles of a triangle is If two angles of one triangle are equal respectively to two angles of another triangle , then the third angle of the of the first triangle