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a=h
P=1/2 a*a
P=1/2 a²
a²+a²=5²
2a²=25 /:2
a²=12,5
a²=1/2 *25 /√
a=5/√2
a=5/√2 *√2/√2
a=5√2/2
P=1/2 a²
a²=12,5
P=1/2 *12,5
P=6,25
x = 5/√2
P = x²/2 = (5/√2)²/2 = [25/2]/2 = 25/4
P = 25/4 jednostek kwadratowych
a=5:2 = 2,5
h=2,5
P1=1/2*2,5 *2,5
P1=3,125
P=2*P1
P=6,25 [cm2]
Pole wynosi 6,25 cm 2.