SOLUTION: Why must the base and height of a parallelogram intersect at a right angle?

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Question 983921: Why must the base and height of a parallelogram intersect at a right angle?
Answer by MathLover1(20855) About Me  (Show Source):
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Why must the base and height of a parallelogram intersect at a right angle?
The altitude (or height) of a parallelogram is the perpendicular distance (perpendicular line segments form 90 degree angle, or perpendicular lines- means lines that form right angles) from the base to the opposite side (which may have to be extended).