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a (krawędź podstawy) = 10
b (krawędź boczna) = ?
h (wysokość ostrosłupa) = 7
d (przekątna podstawy) = a√2
d = 10√2
z tw. Pitagorasa (1/2xd)² + h² = b²
(5√2)² + 7² = b²
b² = 50 + 49
b² = 99, b>0
b = √99 = 3√11