In rectangle BRAD, BY and AY each measure 5 units. For instance, we can use our knowledge of rectangles (and parallelograms, right triangles, algebra, and trigonometry) to calculate side lengths, diagonal lengths, and practically anything your heart desires. This is especially true if we consider that most doors and windows are rectangular. Knowing about rectangles can open plenty of doors and windows for us. Hopefully we can do more than pick rectangles out of a lineup. This gives millions of young quadrilaterals out there hope that if they work really hard at the right angle, they can one day become rectangles. Wonderful! We've proven that LISA is a rectangle simply by being an equiangular quadrilateral. The internal angles of a quadrilateral add up to 360° (1)Ĩ. Given: LISA is an equiangular quadrilateral. After all, you wouldn't want to be labeled something you aren't, so let's make sure that these quadrilaterals really are rectangles. Is that right? We might want to double-check that, just in case. The first two ways specify that we need to be dealing with a parallelogram first and foremost, but the third talks about any quadrilateral.
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