Oldest

Congruent legs and base angles of isosceles triangles

Khan Academy
530
09:02

Equilateral triangle sides and angles congruent

Khan Academy
472
06:28

Equilateral and isosceles example problems

Khan Academy
496
06:26

Another isosceles example problem

Khan Academy
542
05:33

Example involving an isosceles triangle and parallel lines

Khan Academy
546
03:15

Figuring out all the angles for congruent triangles example

Khan Academy
564
04:34

Basic triangle proofs module example

Khan Academy
548
01:56

Basic triangle proofs module example 2

Khan Academy
487
02:52

Fill-in-the-blank triangle proofs example 1

Khan Academy
550
09:41

Fill-in-the-blank triangle proofs example 2

Khan Academy
540
06:38

Wrong statements in triangle proofs example 1

Khan Academy
565
02:47

Problem involving angle derived from square and circle

Khan Academy
482
08:14