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Problem involving angle derived from square and circle

Khan Academy
486
08:14

Wrong statements in triangle proofs example 1

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571
02:47

Fill-in-the-blank triangle proofs example 2

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543
06:38

Fill-in-the-blank triangle proofs example 1

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554
09:41

Basic triangle proofs module example 2

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491
02:52

Basic triangle proofs module example

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551
01:56

Figuring out all the angles for congruent triangles example

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568
04:34

Example involving an isosceles triangle and parallel lines

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549
03:15

Another isosceles example problem

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545
05:33

Equilateral and isosceles example problems

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498
06:26

Equilateral triangle sides and angles congruent

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475
06:28

Congruent legs and base angles of isosceles triangles

Khan Academy
533
09:02