The distance between goalposts, BC, is three times the distance from the top of the goalpost to the ground. If the perimeter of ABCD is 21 1/3 yards, what is the length of BC?
If goal post is rectangle shaped then u can see distance of bc base is 3 times of its sides(distance from top to ground)(imagine aectangle) So let x be the distance so bc=3x Perimeter is given now u just put values in a formua of perimeter
