Answer:
The height is 4 inches.
Step-by-step explanation:
The formula for determining the area of a trapezoid is expressed as
Area = 1/2(a + b)h
Where
a and b are the length of The bases are the 2 sides of the trapezoid which are parallel with one another.
h represents the height of the trapezoid.
From the information given,
a = 9 inches
b = 11 inches
If It has an area of 40 inches² , then
40 = 1/2(9 + 11)h
Cross multiplying by 2, it becomes
40 × 2 = (9 + 11)h
80 = 20h
h = 80/20 = 4 inches