x² = 7² + 8² - 2 * 7 * 8 * cos60*
x² = 49 + 64 - 112 * 1/2
x² = 113 - 56
x² = 57
x = √57 cm -------- odpowiedx
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x² = 7² + 8² - 2 * 7 * 8 * cos60*
x² = 49 + 64 - 112 * 1/2
x² = 113 - 56
x² = 57
x = √57 cm -------- odpowiedx