Question

varog mult cine poate ex 11 b,c si ex 12 a

Answer 1

11.
Suma unghiurilor unui patrulater este 360.
b)a+b+c+d=360
a/2=b/3=c/6=d/7=k
a=2k
b=3k
c=6k
d=7k
2k+3k+6k+7k=360
18k=360 =>k=20
=>a=40
=>b=60
=>c=120
=>d=140

c)a+b+c+d=360
a/6=b/8=c/10=d/12=k
a=6k
b=8k
c=10k
d=12k
6k+8k+10k+12k=360
36k=360 =>k=10
=>a=60
=>b=80
=>c=100
=>d=120

12.
a)a+b+c+d=360
2a=3b=6c=9d=k
a=k/2
b=k/3
c=k/6
d=k/9
k/2 + k/3 + k/6 + k/9 = 360
Numitorul comun este 18.
9k+6k+3k+2k=360·18
20k=360·18 
2k=36·18 =>k=324
=>a=162
=>b=108
=>c=54
=>d=36