## Why are congruent triangles important in real life?

Congruent Triangles are an important part of our everyday world, especially for reinforcing many structures. Two triangles are congruent if they are completely identical. This means that the matching sides must be the same length and the matching angles must be the same size.

**What are three ways triangles show congruence?**

There are five ways to find if two triangles are congruent: SSS, SAS, ASA, AAS and HL.SSS (side, side, side) SSS stands for “side, side, side” and means that we have two triangles with all three sides equal. SAS (side, angle, side) ASA (angle, side, angle) AAS (angle, angle, side) HL (hypotenuse, leg)

### How do you prove triangles?

25:37Suggested clip 118 secondsGeometry – Proofs for Triangles – YouTubeYouTubeStart of suggested clipEnd of suggested clip

**Can triangles be congruent by AAA?**

Knowing only angle-angle-angle (AAA) does not work because it can produce similar but not congruent triangles. We said if you know that 3 sides of one triangle are congruent to 3 sides of another triangle, they have to be congruent.

## What does congruent mean?

Congruent means same shape and same size. So congruent has to do with comparing two figures, and equivalent means two expressions are equal. So to say two line segments are congruent relates to the measures of the two lines are equal.

**How can you tell if two triangles are similar?**

If two pairs of corresponding angles in a pair of triangles are congruent, then the triangles are similar. We know this because if two angle pairs are the same, then the third pair must also be equal. When the three angle pairs are all equal, the three pairs of sides must also be in proportion.

### What similarity theorem would prove that these triangles are similar?

SAS Theorem If we can show that all three sides of one triangle are proportional to the three sides of another triangle, then it follows logically that the angle measurements must also be the same. In other words, we are going to use the SSS similarity postulate to prove triangles are similar.

**Are the two triangles similar How do you know no yes by AA?**

There are several conditions where triangles can be proved similar: AA – where two of the angles are same. SAS – where two sides of a triangle compare to the corresponding sides in the other are in same proportion, and the angle in the middle are equal.

## Is SSA a similarity theorem?

While two pairs of sides are proportional and one pair of angles are congruent, the angles are not the included angles. This is SSA, which is not a similarity criterion. Therefore, you cannot say for sure that the triangles are similar.

**What are the 3 triangle similarity theorems?**

Similar triangles are easy to identify because you can apply three theorems specific to triangles. These three theorems, known as Angle – Angle (AA), Side – Angle – Side (SAS), and Side – Side – Side (SSS), are foolproof methods for determining similarity in triangles.

### Is AAA a similarity theorem?

Euclidean geometry may be reformulated as the AAA (angle-angle-angle) similarity theorem: two triangles have their corresponding angles equal if and only if their corresponding sides are proportional.

**Is Asa a congruence theorem?**

The Angle-Side-Angle Postulate (ASA) states that if 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.

## Is there an ASA similarity condition for triangles?

Congruent Triangles – Two angles and included side (ASA) Definition: Triangles are congruent if any two angles and their included side are equal in both triangles.

**What is the SSA Theorem?**

The acronym SSA (side-side-angle) refers to the criterion of congruence of two triangles: if two sides and an angle not include between them are respectively equal to two sides and an angle of the other then the two triangles are equal.