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Answer:
the greatest common factor of this is 3
SA = 2520 ft^2
Step-by-step explanation:
a = 21ft
b = 29ft
c = 20ft
h = 30ft
SA = 2 + (a+b+c)h
= s(s﹣a)(s﹣b)(s﹣c)
s =
SA= ah + bh + ch +
SA= (21 * 30) + (29 * 30) + (20 * 30) +