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Triangles
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Demonstrations 21  40 of 589
Height of Object from Angle of Elevation Using Tangent
The Apollonius Circle of a Triangle
Orthopolar Lines for a Quadrilateral
Total Areas of Alternating Subtriangles in a Regular Polygon with 2n Sides
Obtuse Random Triangles from Three Points in a Rectangle
Heron's Formula
31. Construct a Triangle ABC Given the Length of AB, an Adjacent Angle and the Difference of the Lengths of the Other Two Sides
30. Construct a Triangle ABC Given the Length of AB, the Angle at C and the Difference of the Other Two Sides
28. Construct a Triangle ABC Given the Length of AB, the Sum of the Other Two Sides, and a Line Containing C
Labeled FussCatalan Polygon Divisions
20b. Construct a Triangle Given the Length of Its Base, the Difference of Its Base Angles and a Line Containing the Third Vertex
Acute Sets in Euclidean Spaces
23. Construct a Triangle Given Two Sides and the Inradius
22. Construct a Triangle Given the Hypotenuse and the Length of an Angle Bisector
Given a Segment, Construct Its Perpendicular Bisector; Given a Triangle, Construct Its Circumcircle
27b. Construct a Triangle Given Its Perimeter, an Angle and the Length of the Altitude to the Side Opposite the Angle
27a. Construct a Triangle Given a Side, the Length of the Altitude to It and the Opposite Angle
26c. Construct a Triangle Given the Length of Its Base, the Angle Opposite the Base and the Length of That Angle's Bisector
26b. Construct a Triangle Given the Length of Its Base, the Angle Opposite the Base and the Length of That Angle's Bisector
25. Construct a Triangle Given Its Base, the Difference of the Base Angles and the Length of One of Three Line Segments
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