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Theorem 2: tangent and radius always meets at right angles
Author:
Graham Burnby-Crouch
Topic:
Angles
B is the centre
GeoGebra
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Poorly Drawn Parallelograms
Droste effect
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探究由平行線和截線所成的角
Poorly Drawn Parallelograms 3
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Equal Area Paralleogram and Right Triangle SDARLEY
Example 4
testGreek
PolygonMove
geogebra
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