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Question Number 89270 by jagoll last updated on 16/Apr/20

w h a t i s t h e m a x i m u m

p e r i m e t e r o f a p a r a l l e l o g r a m

A B C D w h i c h i n s c r i b e d t h e

e l l i p s e \frac{x^{2}}{4} + y^{2} = 1 ?