Hello, Ron!
The perimeter of a trapezium is 104 m.
Its non-parallel sides are 18 m & 22 m.
Its altitude is 16 m.
How do I find the area of the trapezium?
Use the area formula.
Formula: .$\displaystyle \boxed{A \;=\;\tfrac{1}{2}h(b_1 + b_2)}$
. . where .$\displaystyle \,h$ = height, $\displaystyle b_1,b_2$ = parallel sides.
Code:
b1
* * * * *
* *
18 * * 22
* *
* *
* *
* * * * * * * * * * *
b2
The perimeter is 104 m.
. . $\displaystyle b_1 + 22 + b_2 + 18 \:=\:104 \quad\Rightarrow\quad \boxed{b_1 + b_2 = 64}$
We are given: .$\displaystyle \boxed{h \,=\,16}$
Substitute into the formula . . .