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a) pole: 10*10 + * 25
obw: 20 + *10
b) pole: a*b - (1/2 * * 1c/2
obw: 2*b + a + c*
6.
x=4 (wysokosc trapezu)
pole = ((3+10)*4/)2 + 3*4
pole = 26+12 = 38