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obw trójkąta- 15 cm
ramie a- x
ramiona b- y
15 cm-(7*2)= 15 cm-14 cm= 1 cm
Odp; Podstawa tego trójkąta ma 1 cm a ramiona po 7 cm
14/2= 7
2) 16/4=4
4-2 = 2 cm
4+2 = 6 cm
P=a × b
P=2 × 6
P= 12 cm²