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Demonstrations 101  120 of 158
Dividing a Triangle by Lines Parallel to Two Sides
Subtriangles Formed by Concurrent Lines Parallel to the Sides of a Triangle
The Area of the Incentral Triangle
Areas of Parallelograms and Trapezoids
Sum of Reciprocals of Triangular Numbers
The ArithmeticLogarithmicGeometric Mean Inequality
Visual Computation of an Integral
Calculating Area, Perimeter, and Diagonal Length of a Rectangle
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
Two Triangles of Equal Area on Either Side of an Angle Bisector
The Product of the Inradius and Three Exradii
Another Relation between the Areas of Triangles Associated with an Excircle
On the Areas of Triangles Associated with an Excircle
The Sum of the Square Roots of the Areas of Three Subtriangles
Routh's Theorem
The Area of the Pedal Triangle of the Centroid
How Area Changes with Diameter
The Area of the Excentral Triangle
Estimating the Surface Area and Volume of a Rectangular Prism
Estimating the Side Length of a Square from Its Area
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