5.a) 22/3+56/9+6+71/9=
66+56+54+71/9=247/9 cm
b) 8√3+10√3+8√3+9√3=35√3 cm
7. Se folosește formula (n-2)×180°/n
a) (4-2)×180°/4=90°
b) (5-2)×180°/5=108°
c) (6-2)×180°/6=120°
d) (10-2)×180°/10=144°
Sper că te-am ajutat!
11. a) a/2=b/3=c/4=d/6=k a+b+c+d=360⁰ a,b,c,d --- unghiurile
a/2=k a=2k
b/3=k b=3k
c/4=k c=4k
d/6=k d=6k
2k+3k+4k+6k=360 15k=360 k=360/15=24
a=2k=48⁰ b=3k=72⁰ c=4k=96⁰ d=6k=144⁰
c) a/6=b/8=c/10=d/12=k a+b+c+d=360⁰ a,b,c,d --- unghiurile
a/6=k a=6k
b/8=k b=8k
c/10=k c=10k
d/12=k d=12k
6k+8k+10k+12k=360 36k=360 k=360/36=10
a=6k=60⁰ b=8k=80⁰ c=10k=100⁰ d=12k=120⁰
b) a/2=b/3=c/6=d/7=k a+b+c+d=360⁰ a,b,c,d --- unghiurile
a/2=k a=2k
b/3=k b=3k
c/6=k c=6k
d/7=k d=7k
2k+3k+6k+7k=360 18k=360 k=360/18=20
a=2k=40⁰ b=3k=60⁰ c=6k=120⁰ d=7k=140⁰
