1) the height is 6 in
[tex] \frac{h \times 5}{2} = 15 \\ h \times 5 = 30 \\ h = \frac{30}{5} = 6[/tex]
2)base is 18.08 ft
[tex] \frac{24 \times b}{2} = 217 \\ 24 \times b = 434 \\ b = 18.08[/tex]
3)
[tex] \frac{30 \times h}{2} = 225 \\ 30 \times h = 450 \\ h = 15[/tex]
good luck