1 8-sinf geom yangi. 1-8-bet. 2015(boshi). p65

A) 136°; B) 162°; D) 156°; E) 148°.

2. 
   Ko‘pburchak ichki burchaklari va bitta tashqi burchagining yig‘indisi 2070° ga teng. Shu ko‘pburchakning tomonlari soni nechta?
   

A) 13 ta; B) 16 ta; D) 11 ta; E) 15 ta.

3. 
   Har bir ichki burchagi 156° bo‘lgan qavariq ko‘pburchakning nechta burchagi bor?
   

A) 10; B) 15; D) 12; E) 8.

4. 
   Qavariq to‘rtburchakning burchaklaridan biri to‘g‘ri burchak, qolganlari esa o‘zaro 6:5:4 nisbatda. To‘rtburchakning kichik burchagini toping.
   

A) 108°; B) 60°; D) 72°; E) 90°.

5. 
   Ikkita burchagining yig‘indisi 100° ga teng bo‘lgan parallelogrammning kat­ta burchagini toping.
   

A) 100°; B) 110°; D) 130°; E) 150°.

6. 
   Parallelogrammning ikki tomoni nisbati 3:7 ga, uning perimetri esa 18 sm ga teng. Shu parallelogrammning kichik tomonini toping.
   

A) 2,7 sm; B) 5,4 sm; D) 3,4 sm; E) 4,5 sm.

7. 
   Parallelogramm burchaklaridan biri ikkinchisidan 30° ga katta. Uning katta burchagini toping.