a)
AB = 8cm => CD = 8cm
BC = 8cm => AD = 8cm
Pabcd = 8cm * 4
= 32cm
b)
AD = 2,5cm => BC = 2,5cm
DC = 3,6 cm => AB = 3.6cm
Pabcd = 2,5cm * 2 + 3,6cm * 2
= 5cm + 7,2cm
= 12,2 cm
c)
AB = 1,7dm => CD = 1,7dm
AD = 120mm => BC = 120mm
120mm = 1,2dm => AD = 1,2dm
BC = 1,2dm
Pabcd = 1,7dm * 2 + 1,2dm * 2
= 3,4dm + 2,4dm
= 5,8dm
