##### Like what you saw?

##### Create FREE Account and:

- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- Attend and watch FREE live webinar on useful topics

# SSS and SAS - Problem 1

###### Brian McCall

###### Brian McCall

**Univ. of Wisconsin**

J.D. Univ. of Wisconsin Law school

Brian was a geometry teacher through the Teach for America program and started the geometry program at his school

One way of finding out if two triangles are congruent is if all three sides of both triangles are congruent. You can tell if sides of a triangle are congruent if they have the same number of dashes running through them. If for each side of a triangle, there is a corresponding side that is congruent in the other triangle, the two triangles are congruent.

It is important to label the triangles in such a way that they are congruent. For example, triangle ABC being congruent to triangle DEF implies that AB is congruent to DE, BC is congruent to EF, and CA is congruent to FD.

Let’s look at these two triangles first we’re going to ask can we say that two triangles are congruent and then we’ll say well which short cut are we using. Well we see AC corresponds to EF, we see that AB corresponds to DE and we see that CB corresponds to DF.

So we know three corresponding sides are congruent, so I’m going to say that triangle ABC is congruent to this triangle DEF. But what’s the order that I’m going write my vertices at? It has to be very specific. Angle A has top correspond to a certain angle in this triangle.

Let’s start by looking at side AB. Side AB has one mark which means that it must be congruent top DE, so I’m going to write DE first, which means that AB corresponds to DE. Well that makes it pretty easy because there’s only one other vertex and that’s F. So triangle ABC is congruent to triangle DEF and our short-cut is side-side-side.

So you notice what we did, by only knowing the three sides of this two triangles we are able to say that everything about them must be congruent.

Please enter your name.

Are you sure you want to delete this comment?

###### Brian McCall

B.S. in Chemical Engineering, University of Wisconsin

J.D. University of Wisconsin Law School (magna cum laude)

He doesn't beat around the bush. His straightforward teaching style is effective and his subtle midwestern accent is engaging. There's never a dull moment with him.

so my teacher can't explain this in 5 weeks but I learn this in less than 3 minutes”

its hard to focus when the teacher is really really really goodlooking”

i like how it took you 3 minutes and 8 seconds to accomplish what my teacher couldn't in 3 days”

###### Get Peer Support on User Forum

Peer helping is a great way to learn. Join your peers to ask & answer questions and share ideas.

##### Concept (1)

##### Sample Problems (4)

Need help with a problem?

Watch expert teachers solve similar problems.

## Comments (0)

Please Sign in or Sign up to add your comment.

## ·

Delete