What is the area of the trapezoid 18m 12m 23m

The formula for area of a Trapezoid is a+b/2 * h.

Your A: is 12 which is the base

Your B is: 12 which is your second base so you divide that by 2

And then multiply that by your height which is 23.

And you get 345 as you are of the trapezoid.