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A capital letter with a right angle is a "L." In typography, the term "L" refers to the letter "L" in uppercase form. The right angle is formed by the vertical stroke and the horizontal stroke intersecting at a 90-degree angle. This characteristic distinguishes the letter "L" from other letters in the alphabet.
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The short answer is: because that is what a kite is. Long answer (although some minor steps have been skipped): Consider a kite, ABCD, where AB = DA and BC = CD Draw the diagonal AC. Then triangles ABC and ACD are congruent (SSS). So angle BAC = angle DAC. Now draw diagonal BD which intersects AC at E. Then triangles ABE and ADE are congruent (SAS) So angle AEB = angle AED. But these angles are supplementary. Therefore they must be right angles.