Question

calculati in 2 moduri ,perimetrul dreptunghiului cu: a)lungimea de 9cm si latimea de 6 cm. b)latimea de 14 cm iar lungimea cu 8 cmmai mare . c)lungimea de 6 dm iar latimea de 5 ori mai mica

Answer 1

a) 1.9×2+6×2=18+12=30cm
     2.(9+6)×2=15×2=30cm

b)L=14+8
   L=22
1.14×2+22×2=28+44=72cm
2.(14+22)×2=36×2=72cm

c) 6dm=60cm
     l=60:5
     l=12
  1.60×2+12×2=120+24=144cm
   2.(60+12)×2=72×2=144cm