Answer:
SA = 2520 ft^2
Step-by-step explanation:
a = 21ft
b = 29ft
c = 20ft
h = 30ft
SA = 2[tex]A_{B}[/tex] + (a+b+c)h
[tex]A_{B}[/tex] = s(s﹣a)(s﹣b)(s﹣c)
s = [tex]\frac{a + b + c}{2}[/tex]
SA= ah + bh + ch + [tex]\frac{1}{2}[/tex] [tex]\sqrt{-a^4 + 2(ab)^2 + 2(ac)^2 - b^4 + 2(bc)^2 - c4}[/tex]
SA= (21 * 30) + (29 * 30) + (20 * 30) +
[tex]\frac{1}{2}[/tex] [tex]\sqrt{-(21)^4 + 2(21 * 29)^2 + 2(21 * 20)^2 - (29)^4 + 2(29 * 20)^2 - (20)^4}[/tex]
SA = 2520 ft^2
