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1.
a=6
b=16
α=45°
sinα=√2/2 (patrz: tablice)
P=6*16*√2/2
48√2 cm²
2.
szukamy kata ostrego, ale sinα=sin(180°-α)
a=10
P=a²*sin 60°
P=100*√3/2
P=50√3 cm²