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High School Geometry
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Demonstrations 141  160 of 309
Bennett's OctagontoSquare Dissection
Viviani's Theorem
The ThreeChord Lemma
The Chordal Theorem
Secant Intersection with Two Internally Tangent Circles
How the Altitude Divides the Hypotenuse
Unfolding Polyhedron Nets
Dividing a Right Triangle by the Altitude to the Hypotenuse
Bradley's TwoTrianglestoOne Dissection
The Area of a Triangle as Half a Rectangle
Inscribed Angles That Intercept the Same Arc
Nets of Polyhedra
Tangent Circles
Division of the Opposite Side by an Angle Bisector
Equally Distant Chords
Side Lengths Opposite Unequal Angles
Tangents to a Circle
Tangent Chord Angle
Triangles: Scalene, Isosceles, and Equilateral
Triangles: Acute, Right, and Obtuse
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