Any rectangle is a parallelogram.
This follows from angles and adding up .
Since parallelograms have their opposite sides equal, so do rectangles. In the picture, and .
Rectangles are the only parallelograms to be also cyclic (since opposite angles add up .
Notice that every square is also a rectangle, but there are rectangles that are not squares
Since joins midpoints of sides in triangle , we have . Similarly we have , and and thus the sides of quadrilateral are all equal, in other words, is a rhombus.
|Date of creation||2013-03-22 12:02:29|
|Last modified on||2013-03-22 12:02:29|
|Last modified by||drini (3)|