Analytic geometry (polygon in the coordinate system).
Mark the point on the coordinate system and draw the polygon (attachment).
This is the trapezoid.
The formula of an area of a trapezoid:

a, b - the lengths of the parallel sides
h - the height
Substitute:
![a=9,\ b=7,\ h=8\\\\A=(9+7)/(2)\cdot8=(16)/(2)\cdot8=8\cdot8=64[u^2]](https://img.qammunity.org/2023/formulas/mathematics/high-school/j2mjje4rjno6nny8t8xfkggzcoov351cg8.png)
