# Triangles congruent by SAS and HL proofs

0/1
##### Introduction
###### Lessons
1. Similar tirangles VS. Congruent triangles
2. Ways to prove congruency:
• SSS
• SAS
• ASA
• AAS
0/6
##### Examples
###### Lessons
1. Write a two-column proof.
1. Given: R is the midpoint of $\overline {MP}$.
R is the midpoint of $\overline {NQ}$.
Prove: $\triangle MRN$$\cong$$\triangle PRQ$

2. Special case for right triangle:
Given: $\triangle ABC$ is an isosceles triangle.
D is the midpoint of $\overline {AC}$.
Prove: $\triangle ABD$$\cong$$\triangle CBD$.

2. Write a flow proof
1. Given: R is the midpoint of $\overline {MP}$.
R is the midpoint of $\overline {NQ}$.
Prove: $\triangle MRN$$\cong$$\triangle PRQ$

2. Special case for right triangle:
Given: $\triangle ABC$ is an isosceles triangle.
D is the midpoint of $\overline {AC}$.
Prove: $\triangle ABD$$\cong$$\triangle CBD$.

3. Is there enough information given to prove the following triangles are congruent? If so, explain your reasoning and point out the theorem or postulate you use.

###### Free to Join!
StudyPug is a learning help platform covering math and science from grade 4 all the way to second year university. Our video tutorials, unlimited practice problems, and step-by-step explanations provide you or your child with all the help you need to master concepts. On top of that, it's fun - with achievements, customizable avatars, and awards to keep you motivated.
• #### Easily See Your Progress

We track the progress you've made on a topic so you know what you've done. From the course view you can easily see what topics have what and the progress you've made on them. Fill the rings to completely master that section or mouse over the icon to see more details.