explain how DEAR is a trapesium.which of it's two sides are parallel
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DR and EA are the sides parallel to each other
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in a quadrilateral , if two adjacent angles make the sum of 180 degree then the two lines are parallel. in the above picture angle D + angle E aadd up to 180 degree. similarly angle A +angle R add up to 180 degree. so EA is parallel to DR
a quadrilateral having a pair of opposite sides parallel and other pair non-parallel is known as a trapezium.
hope it helps.
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