(20+30)×5=250
(70+20)×4=360
(5+4)×70=630
(3+4)×30=210
(20+10)×6=180
(40+30)×2=140
(20×10)+8=240
(5+3)×10=80
Р=(4+6)×2=20см
Р=(10+20)×2=60см
(20+30)×5=250
(70+20)×4=360
(5+4)×70=630
(3+4)×30=210
(20+10)×6=180
(40+30)×2=140
(20×10)+8=240
(5+3)×10=80
Р=(4+6)×2=20см
Р=(10+20)×2=60см