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Transcript
```Geometry
Chapter 4
Postulate 20 â Side-Angle-Side (SAS) Congruence Postulate
If two sides and the included angle of one triangle are
congruent to two sides and the included angle of a second
triangle, then the two triangles are congruent
Theorem 4.5 â Hypotenuse-Leg (HL) Congruence Theorem
If the hypotenuse and a leg of a right triangle are congruent to the
hypotenuse and a leg of a second right triangle, then the two triangles
are congruent
Postulate 21 â Angle-Side-Angle (ASA) Congruence Postulate
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
Theorem 4.6 â Angle-Angle-Side (AAS) Congruence Theorem
If two angles and the non-included side are congruent to two
angles and the non-included side of another triangle, then the
two triangles are congruent
Theorem 4.7 â Base Angle Theorem
If two sides of a triangle are congruent, then the angles opposite them are congruent
Theorem 4.8 â Converse to the Base Angle Theorem
If two angles of a triangle are congruent, then the sides opposite them are congruent
Corollary to the Base Angle Theorem
If a triangle is equilateral, then it is equiangular
3
```
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