Congruent Lines

Find y.

• 130

• 50

If two lines are congruent, what can you say about their lengths?

• Their lengths are equal to zero.

• They have different lengths.

• Their lengths are unknown.

• They have the same length.

If line AB is congruent to line CD, how would you write it using the symbol for congruence?

• AB == CD

• AB = CD

• AB ≅ CD

• AB ~ CD

What are the properties of congruent lines?

• Same length and shape

• Different length and same shape

• Same length and different shape

• Different length and different shape

What does it mean for two lines to be congruent?

• Different length and shape

• Same length but different shape

• Same length and shape

• Different length but same shape

What is the symbol used to represent congruence between two lines?

• ~

• =

• ≅

• ≈

If line AB is congruent to line CD and line CD is congruent to line EF, can you say that line AB is congruent to line EF? Why or why not?

• No, because congruence is not reflexive.

• No, because congruence is only defined between two objects.

• No, because congruence is not transitive.

• Yes

True or False: Congruent lines have the same slope.

• Not always

• False

• Sometimes

• True

True or False: Congruent lines have the same y-intercept.

• Not always

• True

• False

• Sometimes

If line AB is congruent to line CD, can you say that line CD is also congruent to line AB? Why or why not?

• No, because congruence is not transitive.

• Yes

• No, because congruence is not a symmetric relationship.

• No, because congruence is a one-way relationship.