A quadrilateral with both pairs of opposite sides parallel
What is a parallelogram
200
An example that proves the conjecture to be false
What is counterexample
200
Part following the if in the conditional
What is a hypothesis
200
All angles acute
What is acute triangle
200
Corresponding parts of congruent triangles are congruent
What is CPCTC
200
a parallelogram with four congruent sides.
What is rhombus
300
A series of points that extends in two opposite directions without an end
What is a line
300
The part following the then in the conditional
What is a conclusion
300
One right angle
What is right triangle
300
Three sides of one triangle are congruent to the three sides of another triangle, then two triangles are congruent.
What is Side-Side-Side postulate
300
A parallelogram with four right angles
What is a rectangle
400
points that lie on the same line
What is collinear points
400
Conditional switches the hypothesis and the conclusion
What is a converse
400
One obtuse angle
What is an obtuse triangle
400
Two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the two triangles are congruent.
What is the Side-Angle-Side postulate
400
A parallelogram with four congruent sides and four right angles
What is a square
500
A flat surface that has no thickness
What is a plane
500
Combining a conditional and its converse if they are too
What is a biconditional
500
all sides are congruent
What is equilateral
500
Two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the two triangles are congruent.
What is Angle-Side-Angle postulate
500
A quadrilateral with exactly one pair of parallel sides