Incenter and incircles of a triangle | Geometry | Khan Academy
Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
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Inradius, perimeter, and area | Special properties and parts of triangles | Geometry | Khan Academy
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Angle bisector theorem proof | Special properties and parts of triangles | Geometry | Khan Academy
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Area of a Rectangle, Triangle, Circle & Sector, Trapezoid, Square, Parallelogram, Rhombus, Geometry
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The Khan Academy
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