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2014-09-12T14:23:03+03:00
1.
P= 2AB+2BC
P=2*6+2*1
P=12+2=14cm
2.
P=2AD+2DC
P=2*3000cm+2*4000cm=6000+8000=14000cm
3.
AB=CD=12
CD= \frac{80}{100} *BC
BC= \frac{100*12}{80} =15
P=2AB+2BC
P=2*12+2*15
P=24+30=54
4.
AB+BC+AC=30
AB+BC+9=30
AB+BC=21
P=2(AB+BC)
P=2*21=42

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