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Triangles And Its Properties

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Published in: AIEEE | Mathematics
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Assignment On Triangles And Its Properties.

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  1. PROPS.OF TRIAN-I In a triangle ABC, if a : b : c = 7 : 8 : 9, then cos A : cos B = 11 63 22 (B) 63 5 9 ALLOTED TIME:45MIN (D*) none of these (D* ) a2b2 2. 3. 4. 5. If c2 = a2 + b2, 2s = a + b + c, then 4s(s — a)(s — b)(s — c) = (B) b2c2 (C) c2a2 If cot— , then the AABC is 2 2 (A) isosceles (B) equilateral (C*) right angled (D) none of these In a triangle ABC, (a + b + c)(b + c — a) = bc if The sides of a AABC satisfy the equation, 2a2 + 4b2 + c2 = 4ab + 2ac. Then (A) the triangle is isosceles (C*) B = cos 8 Comprehension—(QN.6-8) (B) the triangle is obtuse 1 (D) A = cos 4 A, B, C respectively Let a, b, c are the sides opposite to angle b a C - —cot— and tan in a AABC - , -3 and cos (A — B) = sinA sinB sinc 2 2 6. 7. 8. 9. 10. 11. Angle C is equal to 4 2 Area of the triangle is equal to Value of sin A is equal to 1 311 4 (C) 10 1 0, then is equal to 1 4 5 27t (D) 3 (D) 11 1 (D) 2 2 In if cos + Sin A cos B + sin B 45 211 In A ABC, A- 3 A) 66 cm In A ABC, if cot A = — , b —c = 36 cm and area of A ABC = C) 18cm 3 a cm 2 *B) 9cm , then BC = D) 27cm — , cot C a then which of the following can be true?

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