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II bok - 2√10
III bok - 10
a²+(2√10)² = 10²
a²+40 = 100
a² = 60
a = √60
a = √(4*15)
a = 2√15
P = 1/2*2√15*2√10
P = 2√150
P = 2√(25*6)
P = 2*5*√6
P = 10√6