O'tkir burchakning sinusi, kosinusi, tangensi va kotangensi (davomi) — 8-sinf Geometriya test savollari

1.To'g'ri burchakli uchburchakda ÐC=90°, AB=18 sm va sinA$=\frac{1}{3}$. BC katetni toping.

• A)6 sm
• B)54 sm
• C)9 sm
• D)3 sm

2.To'g'ri burchakli uchburchakda ÐC=90°, AC=15 sm va cosA$=\frac{5}{6}$. AB gipotenuzani toping.

• A)18 sm
• B)12,5 sm
• C)90 sm
• D)25 sm

3.To'g'ri burchakli uchburchakda ÐC=90°, BC=26 sm va tgA$=\frac{13}{15}$. AC katetni toping.

• A)30 sm
• B)22,53 sm
• C)20 sm
• D)15 sm

4.O'tkir a burchak 0° dan 90° ga qarab kattalashganda, uning sinusi qanday o'zgaradi?

• A)ortib boradi
• B)kamayib boradi
• C)o'zgarmaydi
• D)avval ortadi, keyin kamayadi

5.O'tkir a burchak uchun tga × ctga ko'paytmasi doim nechaga teng?

• A)1
• B)0
• C)-1
• D)2

6.To'g'ri burchakli uchburchakda ÐC=90°, AC=8 sm (a burchakka yopishgan katet) va tgA$=\frac{3}{4}$. BC katetni (a burchak qarshisidagi katet) toping.

• A)6 sm
• B)$\frac{32}{3}$ sm
• C)32 sm
• D)2 sm

7.b = c × cosa formulasi qaysi tasdiqni ifodalaydi?

• A)a burchakka yopishgan katet gipotenuza bilan cosa ning ko'paytmasiga teng
• B)a burchak qarshisidagi katet gipotenuza bilan cosa ning ko'paytmasiga teng
• C)gipotenuza katet bilan cosa ning ko'paytmasiga teng
• D)b katet ikkinchi katet bilan cosa ning ko'paytmasiga teng

8.c = a / sina formulasi qaysi elementni ifodalaydi?

• A)gipotenuzani
• B)burchak qarshisidagi katetni
• C)burchakka yopishgan katetni
• D)o'tkir burchakni

9.To'g'ri burchakli uchburchakda ÐC=90°, AB=10 sm (gipotenuza) va sinA$=\frac{3}{5}$. BC katetni toping.

• A)6 sm
• B)16,67 sm
• C)3 sm
• D)5 sm

10.tga funksiyasi sina va cosa orqali qanday ifodalanadi?

• A)tga = sina / cosa
• B)tga = cosa / sina
• C)tga = sina × cosa
• D)tga $=\frac{1}{sina\cdot cosa}$