Koʻpburchak

Masala :
1. Muntazam o`nburchakning har bir ichki burchagini toping.
Yechish: n = 10


Javob: 144⁰
2. Bitta ichki burchagi 156⁰ ga teng bo`lgan muntazam ko`pburchak tomonlari sonini toping.
Yechish:


( n-2)* 180⁰ = 156⁰n
( 180⁰ – 156⁰) n = 360⁰
24⁰n = 360⁰


Javob: n = 15

Teorema:
Muntazam n burchakning bitta tashqi burchakgi  gradusga teng.

Isbot:

Qo`shni burchaklar yig`indisi 180⁰ ga tengligidan :

Masala
3.Muntazam to`qqizburchakning bitta tashqi burchagini toping.
Yechish: n = 9


Javob: 40⁰




4. Mustahkamlash.( 15 min)
1 Darslikdan № 3, № 4, № 6. o`quvchilar tomonidan doskada bajarish.( 1 ball)
№ 3.

a) n= 3 , α - ?

Javob: 60⁰
b) n = 18, α - ?


Javob: 160⁰
№ 4.

2. n = 6 tashqi burchagi - ?

   
   

Javob: 60⁰