Question

ce lungime si ce latime poate avea un dreptunghi cu perimetru de ; 18cm; 30cm?

Answer 1

Formula de aflare a perimetrului dreptunghiului este:

P=2×L + 2×l
L=este latura mai mare (lumgimea)
l=este latura mai mică (latimea)

18 cm=2×L + 2×l.....L=5...l=4....2×5+2×4=10+8=18

18 cm=2×L + 2×l.....L=6...l=3....2×6+2×3=12+6=18

18 cm=2×L + 2×l.....L=7...l=2....2×7+2×2=14+4=18

18 cm=2×L + 2×l.....L=8...l=1....2×8+2×1=16+2=18

30 cm=2×L + 2×l...L=8...l=7...2×8+2×7=16+14=30

30 cm=2×L + 2×l...L=9...l=6...2×9+2×6=18+12=30

30 cm=2×L +2×l...L=10...l=5...
.....2×10+2×5=20+10=30

30 cm=2×L +2×l...L=11...l=4...
.....2×11+2×4=22+8=30

30 cm=2×L +2×l...L=12...l=3...
.....2×12+2×3=24+6=30

30 cm=2×L +2×l...L=13...l=2...
.....2×1e+2×2=26+4=30

30 cm=2×L +2×l...L=14...l=1...
.....2×14+2×1=28+2=30