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Figuring out all the angles for congruent triangles example

Another example of using congruency to figure out a bunch of angles

Congruent legs and base angles of isosceles triangles

Showing that congruent legs imply equal base angles and vice versa

Introduction to angles (old)

What an angle is. Angles in a circle. Complementary and supplementary angles.

Congruent triangle example 2

Showing that segments have the same length

Area of an equilateral triangle

Finding the formula for the area of an equilateral triangle with side s

Area of diagonal generated triangles of rectangle are equal

Area of Diagonal Generated Triangles of Rectangle are Equal

Equilateral triangle sides and angles congruent

Showing that all of the angles of an equilateral triangle are 60 degrees

Finding congruent triangles

Using the SSS, ASA, SAS, and AAS postulates to find congruent triangles

Angles (part 2)

More on complementary and supplementary angles. Introduction to opposite angles.

Other triangle congruence postulates

SSS, SAS, ASA and AAS postulates for congruent triangles. Showing AAA is only good for similarity and SSA is good for neither

Acute right and obtuse angles

The difference between acute, obtuse and right angles

Angle game (part 2)

More examples of the Angle Game.

The angle game

Using what we know to solve for angles in the Angle Game.

Angles of parallel lines 2

Angles of parallel lines examples

Angles (part 3)

Angles formed when a transversal intersects parallel lines.

Area of an equilateral triangle

Finding the formula for the area of an equilateral triangle with side s