Angles
Angles that are bigger than 0 degrees but smaller than 90 degrees.
What are acute angles
Two angles that add to 90 degrees sometimes found in a right angle
What are complementary angles
A triangle with all sides congruent and all angles congruent
What is an Equilateral Triangle
A quadrilateral with two pairs of parallel sides
What is a parallelogram
Lines that have one common point
What are intersecting lines
Angles that are bigger than 90 degrees but smaller than 180 degrees.
What are obtuse angles
Two angles that add to 180 degrees sometimes found on a line
What are supplementary angles
A triangle with two congruent sides called legs and two congruent base angles
What is an Isosceles Triangle
A quadrilateral with four right angles
What is a rectangle
Formed by two distinct rays that have a common endpoint
What is an angle
Angles that are exactly 90 degrees
What are right angles
Angles formed by two intersecting lines that have a common vertex and no other common points
What are vertical angles
The angles in a triangle always add to this number
What is 180
A quadrilateral with all sides congruent and four right angles
What is a square
Lines that never intersect
What are parallel lines
Angles that are exactly 180 degrees
What are straight angles
Angles formed by two lines cut by a transversal that do not have a common vertex and are in the region between the two lines on different sides of the transversal.
What are alternate interior angles
The theorem involving an angle outside a triangle and two angles inside the triangle
What is the Exterior Angle Theorem
A quadrilateral with all sides congruent
What is a rhombus
Lines that intersect and form right angles
What are perpendicular lines
Angles that are bigger than 180 degrees but smaller than 360 degrees.
What are reflex angles
Angles formed by two lines cut by a transversal that do not have a common vertex, one is an interior angle, the other is an exterior angle and the angles are on the same side of the transversal.
What are corresponding angles
A triangle with no sides congruent
What is a Scalene Triangle
A quadrilateral with one pair of parallel sides
What is a trapezoid
A line, ray or segment that divides a segment into two congruent segments or an angle into two congruent angles
What is a bisector