Răspuns :
catetele AB = AC = 30 km
ipotenuza BC² = AB² + AC² = 30² +30² = 900 + 900 = 1800 = 900 · 2
BC = √1800 = √900 ·√2 = 30√2 km
ipotenuza BC² = AB² + AC² = 30² +30² = 900 + 900 = 1800 = 900 · 2
BC = √1800 = √900 ·√2 = 30√2 km