A triangle in which one angle measures more than 90 degrees
What is an obtuse triangle?
100
Two lines that intersect to form right angles
What are perpendicular lines?
100
A quadrilateral with only one pair of parallel sides; they are called the bases (b1 and b2)
What is a trapezoid?
100
Identical in form, shape and size; a geometrical term that means "equal".
What is the congruent?
200
A pair of angles whose sum is 180 degrees
What are supplementary angles?
200
A triangle in which all three angles are less than 90 degrees
What is an acute triangle?
200
Two or more lines that never intersect
What are parallel lines?
200
A quadrilateral with two pairs of parallel sides
What is a parallelogram?
200
The postulate that states that if the sides of one triangle are congruent to the sides of a second triangle, the triangles are congruent.
What is SSS?
300
A pair of adjacent angles whose non-common sides are opposite rays; a pair of adjacent angles that form a straight line
What is a linear pair?
300
A triangle in which one angle measures exactly 90 degrees
What is a right triangle?
300
A line that intersects two or more parallel lines
What is a transversal?
300
A parallelogram with four right angles
What is a rectangle?
300
The postulate that states that if two sides and the included angle of one triangle are congruent to the two sides and included angle of a second triangle, the triangles are congruent.
What is SAS?
400
A pair of angles that share a common ray and vertex; a pair of angles that are "next to" each other
What are adjacent angles?
400
A triangle with two or more congruent sides
What is an isosceles triangle?
400
Pairs of angles that lie between parallel lines and on opposite sides of the transversal
What are alternate interior angles?
400
A parallelogram with 4 congruent sides
What is a rhombus?
400
The postulate that states that if two angles and the included side of one triangle are congruent to the two angles and the included side of a second triangle, the triangles are congruent.
What is ASA?
500
A pair of angles who share a vertex and are "across from" or "opposite" each other
What are vertical angles?
500
A triangle with three congruent sides and three congruent angles; also known as a "regular" triangle
What is an equilateral (or equiangular) triangle?
500
Angle pairs that lie in the "same location" when a transversal intersects parallel lines
What are corresponding angles?
500
A parallelogram with four congruent sides and four right angles; also known as a "regular" quadrilateral
What is a square?
500
The other two triangle congruence postulates that haven't been mentioned yet.