Table of Contents
What are the 4 triangle theorems?
Angles:
| Right Angles | All right angles are congruent. |
|---|---|
| Base Angle Theorem (Isosceles Triangle) | If two sides of a triangle are congruent, the angles opposite these sides are congruent. |
| Base Angle Converse (Isosceles Triangle) | If two angles of a triangle are congruent, the sides opposite these angles are congruent. |
What are the congruence proofs?
If two sides and the included angle of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent. If two angles and the included side of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent.
What is SSS SAS ASA and AAS congruence?
SSS (side-side-side) All three corresponding sides are congruent. SAS (side-angle-side) Two sides and the angle between them are congruent. ASA (angle-side-angle)
What are the triangle congruence theorems?
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)
What are the three methods of proving triangles congruent?
Methods of proving triangles are congruent: Side-Side-Side (SSS) – we have to prove that all three sides are congruent. Side-Angle-Side (SAS) – what’s very important here is that the “Angle” is written between the two sides. Angle-Side-Angle (ASA) – just like the “angle” in SAS is in between two sides; the “Side” here should also be in between two angles.
How to prove if some triangles are congruent?
Side-side-side (SSS): both triangles have three sides that equal to each other. Side-angle-side (SAS): two sides of the triangle and their included angle (the angle between the two sides) are equal in both triangles. Angle-side-angle (ASA): two angles of each triangle and their included side are equal.
How do you prove that a triangle is congruent?
The simplest way to prove that triangles are congruent is to prove that all three sides of the triangle are congruent. When all the sides of two triangles are congruent, the angles of those triangles must also be congruent. This method is called side-side-side, or SSS for short.
Which theorem proves that the triangles are congruent?
Similar or Congruence Triangles Theorem Proof. The theorem states that the two triangles are said to be similar if the corresponding sides and their angles are equal or congruent. Statement: If the corresponding sides of two triangles are proportional, then their corresponding angles are equal and the triangles are similar.