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ramię - 2x
2 × 2x + x = 20
4x + x = 20
5x = 20 /:5
x = 4
odp podstawa ma 4cm, każde z ramion po 8cm
2x = y
x+y+y = 20
x+2x+2x = 20
5x = 20
x = 4
y = 2x = 8
2b+1/2b=20
5/2b=20
b=40/5
b=8
1/2b 8*1/2=4
podstawa wynosi 4cm, a pozostałe boki mają po 8cm.