MATHEMATICS

• Intersecting lines

  • two coplanar lines that have a point in common
• Concurrent lines

  • two or more coplanar lines that intersect at exactly one point
• Perpendicular lines

  • Two lines that intersect and form a right angle
• Perpendicular lines

  • Two lines that intersect and form a right angle
• Skew lines

  • are non-coplanar lines that do not intersect and are not parallel
• Parallel lines

  • coplanar lines that do not intersect
• Transversal

  • is a line intersecting two or more coplanar lines at a different point
• Equilateral triangle

  • are triangle that have a same length of sides
• Isosceles triangle theorem

  • If two sides of a triangle are congruent, then the angles opposite them are also congruent
• Converse of the Isosceles Triangle Theorem

  • If two angles of a triangle are congruent, then the sides opposite them are also congruent
• Exterior Angle

  An exterior angle of a triangle is an angle that forms a linear pair with an interior angle of a triangle when the side of the triangle is extended
• Exterior Angle Theorem (EAT)

  The measure of an exterior angle is equal to the sum of the measure of the two remote interior angle of the triangle
• Interior angles

  • Angles formed between two lines
• Alternate interior angle

  Angles that lie on the opposite sides of a transversal
• Alternate Exterior Angles

  • Two exterior angles that lie on the opposite sides of a transversal
• PAIC

  If two parallel lines are cut by a transversal, then alternate interior angles are congruent
• PAEC

  If two parallel lines are cut by a transversal, then alternate exterior angles are congruent
• Corresponding Angles

  Two angles, one interior and the other exterior, on the same side of the transversal
• PCAC

  If two parallel lines are cut by a transversal, then corresponding angles are congruent