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Demonstrations 121  140 of 163
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
Percentage Change
Rectangles: Perimeter and Area
The Area of a Triangle, its Circumradius, and the Perimeter of its Orthic Triangle
Medial Division of Triangles
The Product of the Inradius and Semiperimeter of a Triangle
The Product of the Side Lengths of a Triangle
Relations between Some Triangles Associated with Excircles
Estimating Perimeter and Area of Simple Polygons
Signed Area of a Polygon
The Area of a Triangle inside the Incircle
A Relation between the Areas of Four Triangles
Three Subtriangles of a Triangle
The Area of the Contact Triangle
Area of a Parallelogram
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