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b=druga przyprostokatna
p=½ab
11m²=½×5½b
b=11:11/4
b=4m=druga przyprostokątna
a = 5½ m
h = ?
P = a * h/ 2
h = 2P/ a
h = 11 * 2 / 5½
h = 22/ 5½
h = 4 cm
Odp: Druga przyprostokątna ma długosć 4 cm.