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B) 1/2 • (6dm + 3dm) • 7dm = 31,5dm²
C) 1/2 • 13cm • 16cm = 104cm²
Zad 2
P = 1/2 • 12cm • 7cm
P = 42cm²
42cm² = 5cm • x
42cm² : 5cm = x
x = 8,4cm
Bok rombu ma 8,4cm