Question

The distance between goalpost, BC, is three times the distance from the top of the goalpost to the bottom. If the perimeter of ABCD is 21 1/3 yards, what is the length of BC

Answer 1

maybe something like this. I do not see your picture.

d = 3 h
2 d + 2 h = 64 feet
6 h + 2 h = 64
8 h = 64
h = 8 feet
d = 3 h = 24 feet = 8 yards