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Euclid's Elements
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Demonstrations 21  40 of 44
The Area of a Triangle as Half a Rectangle
Inscribed Angles That Intercept the Same Arc
Tangent Circles
Division of the Opposite Side by an Angle Bisector
The Eyeball Theorem
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
Finding the Least Common Multiple of Two Numbers by Factoring
The Ratio Theorem
Finding the Greatest Common Divisor of Two Numbers by Factoring
Intersecting Chords Theorem
Opposite Angles of a Quadrilateral in a Circle
The Primes Are Infinite
The EyePentagon Construction
Platonic Solids
Angles in a Triangle Total 180 Degrees
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