3.1: Parallelograms - Mathematics LibreTexts
https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/03%3A_Quadrilaterals/3.01%3A_Parallelograms
WebA parallelogram is a quadrilateral in which the opposite sides are parallel (Figure 3.1.3 ). To discover its properties, we will draw a diagonal, a line connecting the opposite vertices of the parallelogram. In Figure 4, AC is a diagonal of parallelogram ABCD. We will now prove ΔABC ≅ ΔCDA.
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