Answers

2016-03-25T22:43:17+05:30
Area = 1/2*[sum of parallel sides]*distance between them
480 = 1/2*[ 20+x ] *15
480*2 = [ 20+x ] *15
960 = 20 + x * 15
960/15 = 20 + x
66 = 20 + x
46 = x

so the measure of other parallel side is 46m
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2016-03-25T22:50:53+05:30
Area of a trapezium : (sum of parallel sides/2)*height
let other
parallel sides be x
so we get,
480 = ({20+x}/2)*15
480/15 ={20+x}/2
(480*2) / 15=20+x
(960/15)-20=x
64-20=x
44=x
other parallel sides =44m
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