Angle Side / Base-Angle Theorem – Two Column Proofs

This geometry video tutorial explains how to use the angle side theorem also known as the base-angle theorem in two column proofs. The angle side theorem states that if two sides of a triangle are congruent, the angles are congruent and vice versa. This theorem typically applies to an isosceles triangle. This video contains plenty of geometry practice problems that include solving equations with x and inequalities with restrictions on x.

2 Column Proofs of Congruent Segments:

2 Column Proofs of Angles:

Triangle Congruence – SSS, SAS, ASA:

CPCTC – 2 Column Proofs With Triangles:

Median of a Triangle Formula:

Altitude of a Triangle – Orthocenter:

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Triangles, Medians, & Altitudes – Proofs:

2 Column Proofs – Isosceles Triangles:

Hypotenuse Leg Theorem – HL Postulate:

Detour Proofs – Double Triangle Congruence:

Missing Diagrams – 2 Column Proofs:

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