What is the area of this trapezoid? enter your answer in the box. units2 a rectangle with a length of 10 and a height of 9 has two right triangles on each side of it with short leg lengths of 9.

We have that

[the area of the trapezoid]=[area of rectangle]+2*[area of triangle]
[the area of the trapezoid]=[10*9]+2*[9*9/2]
[the area of the trapezoid]=[90]+2*[40.5]= 171 units²

see the attached figure

the answer is 171 units²