I think the best way to do this is by splitting up the trapezoid into two shapes since it is not a regular trapezoid. We can make a split to form a small right triangle on the left and a regular trapezoid on the right.
Small right triangle on the left:
4 inch side length and 6 inch hypotenuse with the Pythagorean theorem will give us the missing side.
missing side = square root of 6^2-4^2 =

Then the area is

Regular trapezoid on the right:
Area will be

Summing up the two areas to get the total we have
in^2.