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b=1+3=4
c=2+3=5
P=ah / 2
h²+2²=5²
h²=21
h=√21
P=4*√21 / 2 = 2√21 j²
a = 1+2 = 3
b = 1+3 = 4
c = 2+3 = 5
zatem a² + b² = c²
3² + 4² = 5²
9 + 16 = 25
P = [3*4] /2 = 6 j²