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h=30cm
p=a*h/2
a=2*p/h
a=1200/30=40cm
P = 6 dm² = 600 cm²
h = 30 cm
a = ?
600 = (a * 30) : 2 / *2
1200 = a * 30 / :30
40 = a
Odp: Długość podstawy wynosi 40 cm.
600=1/2*a*30
600=a*15
a=600:15
a=40cm