A)fie ABCD patrulater concav. Demonstrati ca m<BCD=m<A+m<B+m<d
b)aflati m< unui patrulater covex, stiind ca sunt direct proportionale cu nr:7,8,8,12
c)patrulaterul convez ABCD are m<a=m<c=m<b+m<d. Aflati m<c

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Răspunsuri

2014-07-09T12:59:16+03:00
2. A+B+C+D=360
A/7=B/8=C/8=D/12=k
A=7k
B=8k
C=8k
D=12k
7k+8k+8k+12k=360
35k=360
k=360/35
A=7*360/35=72
B=8*360/35=82grade 17min30sec=C
D=12*360/35
3.
A=C=B+D
A+B+C+D=360
3A=360
A=120=C



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2014-07-09T15:12:20+03:00
Rezolvarile problemelor, le gasesti in fisierul atasat:

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