Ko‘pburchakiar perimetri hamda yuzasini hisoblash

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