72ft
By adding the sides together you get an area of 72ft
90
Step-by-step Step-by-step explanation
my Step-by-step explanation is to find it the long way you have to find the areas of those two triangles (10×6 = 60 and 60÷2 = 30) and (20×6 equals 120÷2= 60) and 60+30=90
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