Rectangle - Wikipedia
The diagonals of a rectangle are 12 inches long and intersect at an angle of 60^o . Find the perimeter of the rectangle. | Homework.Study.com
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javascript - How to calculate rotation angle from rectangle points? - Stack Overflow
geometry - A rectangle has diagonals $d$ and the acute angle between the diagonals $\alpha$, express... - Mathematics Stack Exchange
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Why the angle between a diagonal and a side of rectangle need not be 45°? - Quora
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Conjectures in Geometry: Rectangle Conjectures
Triangle rectangle — Wikipédia
If one angle of a parallelogram is a right angle, then prove that it is a rectangle.
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Parallelogram Geometry Area Line Shape, rectangle shape, angle, rectangle, triangle png | PNGWing
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Finding Angles in a Rectangle | Geometry - YouTube
Finding Angles in a Rectangle - YouTube
