1) AB = AC = 26cm
BC = 31 cm
P = 26 cm + 26 cm + 31 cm = 52 cm + 31 cm = 83 cm
2) AB + BC = 16m
P = 16m x 2
P = 32m
3)AB = AD + 406
BC = 399
Stim ca BC = AD
AB = 399 + 406
AB = 805
P = 399 x 2 + 805 x 2
P = 798 + 1610
P = 2408
4) AB = 3AD
BC = 108m
Stim ca BC = AD
AB = 108m x 3
AB = 324m
P = 108m x 2 + 324m x 2
P = 216m + 648m
P = 864m