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.
n = 6 tashqi burchagi - ?
Javob: 600
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