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Congruent Segment Surprise
Author:
Ted Courant
Given two semi-circles inscribed in a square, construct two segments, and connect their respective intersections, as shown.
GeoGebra
Show that the Red and Blue segments are congruent and perpendicular.
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探究由平行線和截線所成的角
Graphing Logarithmic Functions
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lines and angles
cilindar
H is for Hexagon
House
Interactive Riemann Sum Applet
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General Quadrilateral
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