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26 = ½(a + 3) * 4
26 = 2 (a+3) | / 2
a+3=13
a=10
Odp. Druga podstawa ma długość 10cm
(a+b)*h=52
(3+b)*4=52/4
3+b=13
b=10
26=12+4b/2(nad 2)/*2
52=12+4b
52-12=4b
40=4b/:4
b=10
Odp:Druga podstawa wynosi 10cm