a trapezoid with base measure of 23 km and 29km an area of 390km . find the height of the trapezoid.

Hello!

To find the area of a trapezoid you use the equation

[tex]A = \frac{a+b}{2} h[/tex]

Put in the values you know

[tex]390 = \frac{23+29}{2} h[/tex]

Add

[tex]390 = \frac{52}{2} h[/tex]

Divide

[tex]390 = 26 * h[/tex]

Divide both sides by 26

15 = h

The answer is 15km

Hope this helps!