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3 =a*sin 45 stopni =a* (√2/2)
a = 3 *√2
P = a*h = 3*√2 *3 = 9*√2
Długość boku - 3√2 cm
Pole - 9√2 cm² (P = a × h)
[Korzystamy z trójkąta o katach 90°, 45°, 45°]