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12=(7+b)×4/2
12=(7+b)×2
12=14+2b
-2=2b
-1=b
a=7cm
b=?
h=3 cm
12 = (7+b)*3 / 2
24=(7+b)*3
24=21 +3b
3b = 24-21
3b = 3
b=1cm
krotsza podstawa trapezu wynosi 1 cm