Answer:
other parallel side is 23m
Step-by-step explanation:
Let's assume other parallel sides as 'x'
One of the parallel sides of the trapezium plot measure 18m
so, y=18
distance between the two parallel sides measure 20m
so, h=20
now, we can use area of trapezium formula
[tex]A=\frac{1}{2}\times h \times (x+y)[/tex]
now, we can plug values
[tex]A=\frac{1}{2}\times 20 \times (x+18)[/tex]
we can set A=410
and then we can solve for x
[tex]410=\frac{1}{2}\times 20 \times (x+18)[/tex]
[tex]10\left(x+18\right)=410[/tex]
[tex]x+18=41[/tex]
[tex]x=23[/tex]
