Theorems and Postulates

Question 1

Perpendicular lines ->

Answer 1

Right angles

Question 2

If AB=CD , then CD=AB

Answer 2

Symmetric Property

Question 3

If AB=CD and CD=BC, than AB=BC

Answer 3

Transitive property

Question 4

AB=AB

Answer 4

Reflexive property

Question 5

If angle B and angle A are right angles, what makes them =?

Answer 5

All right angles are congruent.

Question 6

If AB||CD and CD||EF, than AB||EF

Answer 6

If two lines are parallel to the same line, then they are parallel
to each other.

Question 7

The measure of each exterior angle of a triangle equals the sum
of the measures of its two remote interior angles.

Answer 7

Triangle Exterior Angle Theorem

Question 8

If you add the same line to two congruent segments, they are still congruent.

Answer 8

Additive property

Question 9

What are the two ways to prove right triangles congruent?

Answer 9

If a leg and the hypotenuse are congruent, and if both legs are congruent

Question 10

After using the addition property to show two congruent segments plus the same congruent segments are equal, what step is next?

Answer 10

Show that the two new segments are equal using the substitution property.