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Thin Slicing Right Angles in Quadrilaterals
Author:
Steve Phelps
Topic:
Angles
,
Quadrilaterals
Drag the point slowly to the right.
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One right angle
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Two consecutive right angles
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Two opposite right angles
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Three right angles
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alg2_05_05_01_applet_exp_2_flvs
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探究由平行線和截線所成的角
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