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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math
Get ready for Geometry
Get ready for congruence, similarity, and triangle trigonometry
Triangle angles
Triangle angles
Angles in a triangle sum to 180° proof
Find angles in triangles
Isosceles & equilateral triangles problems
Find angles in isosceles triangles
Triangle exterior angle example
Worked example: Triangle angles (intersecting lines)
Worked example: Triangle angles (diagram)
Finding angle measures using triangles
Triangle angle challenge problem
Triangle angle challenge problem 2