the parallel sides of a trapezium are 20cm and 10cm. it's nonparalle sides are both equal, each being 13cm. find the area of trapezium.
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(s): 11Since the length of nonparallel sides are equal, its shape is like "/ \". We divide the trapezium into 3 parts - 2 triangles and a rectangle. base of triangle = (20-10)/2 = 5 height of triangle as well as rectangle^2 = 13^2 - 5^2 height^2 = 144 height = 12 area of trapezium = (1/2)(sum of parallel sides)(height) = (1/2)(10+20)(12) = 180 cm square
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Kyushu1:
but answer is 180
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