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Right Angle Triangle
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Right Angle Triangle
Formula
Special
Right Triangle Formulas
Obtuse
Triangle Formulas
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Formula
Perimeter Formula
Regular Polygon Formula
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Right
Angle Formula
Parallelogram
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6:27
Khan Academy
Sal Khan
Isosceles & equilateral triangles problems
Isosceles triangles have two congruent sides and two congruent base angles. Equilateral triangles have all side lengths equal and all angle measures equal. We use these properties to find missing angles in composite figures. The problems are partly from Art of Problem Solving, by Richard Rusczyk.
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