Search "angles"
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.
Khan Academy
Sal's old angle videos
557
09:56
Congruent triangle example 2
Showing that segments have the same length
Khan Academy
Congruence postulates
569
12:13
Area of an equilateral triangle
Finding the formula for the area of an equilateral triangle with side s
Khan Academy
Perimeter and area of triangles
719
03:42
Area of diagonal generated triangles of rectangle are equal
Area of Diagonal Generated Triangles of Rectangle are Equal
Khan Academy
Perimeter and area of triangles
587
04:35
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
Khan Academy
Congruence postulates
511
07:27
Angles (part 2)
More on complementary and supplementary angles. Introduction to opposite angles.
Khan Academy
Sal's old angle videos
565
09:05
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
Khan Academy
Congruence postulates
629
13:27
Acute right and obtuse angles
The difference between acute, obtuse and right angles
Khan Academy
Sal's old angle videos
553
05:31
The angle game
Using what we know to solve for angles in the Angle Game.
Khan Academy
Sal's old angle videos
562
09:01
Angles of parallel lines 2
Angles of parallel lines examples
Khan Academy
Sal's old angle videos
566
05:14
Angles formed between transversals and parallel lines
Angles of parallel lines
Khan Academy
Sal's old angle videos
530
07:52
Angles (part 3)
Angles formed when a transversal intersects parallel lines.
Khan Academy
Sal's old angle videos
541
09:48
Area of an equilateral triangle
Finding the formula for the area of an equilateral triangle with side s
Khan Academy
Koch snowflake fractal
639
03:42
