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144* - 20* = 124*
124* : 2 = 62*
1 kąt - 62*
2 kąt - 82*
3 kąt - 36*
1kat 36
2kat 62
3 kat 82
x = niewiadoma
1 bok = x +20
2 bok = x
3 bok = 36
180 - 36 =144 = 1 i 2 bok
2 bok = (144 - 20) :2=62
1 bok = 62 +20 = 82