Angle sum of a quadrilateral

作者：mathstobie, amylava

Students move the points around to investigate the angle sum of a quadrilateral. There is also an option to show whether the quadrilateral is convex or concave.

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Rotation By Melanie
LALEEYMEN
quadrilateral inscribed in a circle
Test your knowledge to find the sum mentally
Slope Intercept Form
Glide-Reflections Activity

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立方（體）
菱形
複數
圓
特殊點

Angle sum of a quadrilateral

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