9514 1404 393
Answer:
4 ft = height
10 ft = base
Explanation:
The area of a triangle is given by ...
A = 1/2bh
Filling in the given value, we get the relation ...
20 = 1/2bh
40 = bh
We know the factors of 40 are ...
40 = 1×40 = 2×20 = 4×10 = 5×8
Of the numbers that area available, only the pair 4×10 will give the desired result.
The height is 4 ft; the base is 10 ft.