Matematika 8-sinf uchun. Test №1

A) B)(0;1) C) D) E)

17. va  qo’shni burchaklar . Agar bo’lsa ,  va  burchaklar ayirmasini toping .

A)70⁰ B)60⁰ C)100⁰ D)90⁰ E)80⁰

18. Ikki parallel to’g’ri chiziqmi uchinchi to’g’ri chiziq kesib o’tganda hosil bo’lgan ichki bir tomonli burchaklardan biri ikkinchisidan 17 marta kichik . Shu burchaklardan kichigini toping .

A)20⁰ B)24⁰ C)15⁰ D)10⁰ E)18⁰

19. ABC uchburchakda A uchdagi tashqi burchagi 120⁰ ga , C uchidagi ichki burchagi 80⁰ ga teng , B uchdagi tashqi burchakni toping.

A)160⁰ B)150⁰ C)130⁰ D)120⁰ E)140⁰

20. To’g’ri burchakli uchburchakning gipotenuzasi 25 sm, katetlari o’zaro 3:4 nisbatda. Shu uchburchakning kichik katetini toping.

21. To’g’ri burchakli uchburchakning bir kateti 5 ga , gipotenuzaga tushirilgan balahdligi 3ga teng . Uning ikkinchi katetini toping .

A)3,5 sm B)3,75 sm C)4 sm D)3,8 sm E)3,9 sm

22. Teng yonli uchburchakning balandligi 4 ga , asosi 6 ga teng . Uning yon tomonini toping .

A)5,5 B)7 C)5 D)9 E)4,5

23. To’g’ri burchakli uchburchakning katetlaridan biri 12 , gipotenuzasi esa ikkinchi katetidan 6 ga ortiq . Uchburchakning yuzini toping .

A)36 B)40 C)42 D)54 E)60

24. Agar kvadratning perimetri 10% ga kamaytiril-sa, uning yuzi necha foizga kamayadi ?

A)10 B)11 C)16 D)19 E)8

25. Agar rombning bir diagonalini 10% ga uzayti-rib, ikkinchi diagonalini 15% ga qisqartirilsa , rombning yuzi qanday o’zgaradi ?

A)5% ortadi B)o’zgarmaydi C)6,5% kamayadi D)5,65% kamayadi E)6,5% ortadi