The area of the trapezium is 475cm square and the height is 19cm. Find the length of its two parallel sides if one side is 4cm. greater than the other.
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Area of Trapezium = (a+b) × h
475 = (4+b)×19
4+b = 475/19
4+b = 25
b = 21cm
475 = (4+b)×19
4+b = 475/19
4+b = 25
b = 21cm
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