Question

slove
the area of trapezium of 312cm²and it's height is 24cm if one of the parallel side is 17 cm find the length of other parallel side

Answer 1

Using this method to find area of trapizium
=1÷2(a+b)×h

Answer 2

area of trapezium=312cm^2
312=1/2×(a+b)×h
312=1/2×(17+b)×24
312=(17+b)×12
312=204+12b
312-204=12b
108=12b
108/12=b
9=b

therefore other parallel side is 9cm.