18. Agar uchburchakning burchaklari 5;6 va 7 sonlariga proporsional bo’lsa , uchburchakning katta burchagini toping .
A)750 B)800 C)500 D)400 E)700
19. uchburchak burchaklarining kattaliklari nisbati 1:1:2 kabi, katta tomonining uzunligi 13 ga teng. uchburchakning katta tomoniga tushirilgan balandlikni toping.
A)6,5 B)12 C)8 D)5 E)10
20. Kichik tomoni ga teng bo’lgan uchburchakning burchaklari 1:2:3 kabi nisbatda bo’lsa , uchburchakning perimetrini toping .
A)8+ B)3(2+ ) C) D)9+
E)6+
21. Uchburakning tomonlari 2;3 va 4 ga teng . 3 ga teng tomon qarshisidagi burchakning sinusini toping .
A) B) C) D) E)
22.Qavariq 12 burchakning diagonallari sonini toping?
