Answer:
height = 4/9 ft
Explanation:
Area of a triangle is
0.5 x base x height = area
Note: 10 2/3 = 32/3
85 1/3 = 256/3
0.5 x 32/3 x height = 256/3
multiply by 6 to remove all fractions
3 x 64 x 6height = 512
192 x 6 height = 512
6 height = 8/3
height = 4/9