John is putting together a swing set for his niece. He is confused about which boards
fit together to make the triangular supports because he lost the directions. Which
combination of boards could John use for the triangular supports?
A 3 ft, 9 ft, 5 ft
B 6 ft, 8 ft, 15 ft
C 4 ft, 7 ft, 12 ft
D 7 ft, 6 ft, 2 ft