a = 3-1 = 2
b = 10-4 = 6
h = 6-1 = 5
S = a+b/2 • h = 4•5 = 20
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a = 3-1 = 2
b = 10-4 = 6
h = 6-1 = 5
S = a+b/2 • h = 4•5 = 20