If the three sides of △ ABC are a, B, C, and its area is ᦉ 188; (a ᦉ 178; + B ᦉ 178; - C ᦉ 178;), then what is the internal angle c?

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• 1. If the area of △ ABC is s = a # 178; - (B-C) # 178;, then Tan (A / 2)= A1/2 B1/4 C1/8 D1
• 2. In △ ABC, the opposite sides of inner angles a, B and C are a, B and C respectively. If C = 60 ° and 3AB = 25-c2, the maximum area of △ ABC is______ ．
• 3. The three sides a, B, C of △ ABC satisfy the following conditions: A, B, C = - 178; - 10A + C & # 178; - 26c + 194 + √ (2 / 3b-8) = 0. Try to find the value of a, B, C and judge the shape of △ ABC
• 4. If A.B.C is trilateral of △ ABC, and A.B satisfies the relation (A-3) &# 178; + [B-4 \ = 0, C is a system of inequalities {X-1 / 3 ＞ x-4, {2x + 3 ＜ 6x + 1 / 2} (Continued) to find the three sides of △ ABC By 22:40 today,
• 5. In the triangle ABC, the angle a is equal to 120 degrees, the angle c is equal to 10 degrees, and the angle AB is equal to 12 Make a list of formulas, thank you Be sure to be more detailed In the triangle ABC, the angle a is equal to 120 degrees, the angle c is equal to 10 degrees, and the angle AB is equal to 12 to find BC
• 6. Acute angle △ ABC. Known (b ^ + C ^ - A ^) Tana = √ 3bC 1) find angle a (2) if a = 2, find ∠ a
• 7. In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Given that angle a is an acute angle and B = 3asinb, then Tana=______ ．
• 8. Given that the three sides of triangle ABC are a, B, C respectively, and the area is s = (a ^ 2 + B ^ 2-C ^ 2) / 4, find Sina + cosa
• 9. The triangle ABC is known, and its area is s = 1 / 2a2-1 / 2 (B-C) 2, Sina
• 10. Let ABC be the three sides of △ ABC, and s be the area of triangle. Prove that C ∧ 2-A ∧ 2-B ∧ 2 + 4AB ≥ (4 √ 3) s
• 11. It is known that the opposite sides of the internal angles a, B and C of triangle ABC are a, B and C respectively. If a & # 178; + B & # 178; - C & # 178; + AB = 0, then the size of angle c is?
• 12. Given that the opposite sides of the inner angles a, B and C in the acute angle △ ABC are a, B and C respectively, and a & # 178; + B & # 178; = C & # 178; + AB, find the value of angle C,
• 13. As shown in the figure, in the triangle ABC, the angle a is equal to 60 degrees It is known that, as shown in the figure, in the triangle ABC, the angles a are equal to 60 degrees CE and BF are bisectors of the triangle ABC angles and intersect at point D Prove that De is equal to DF
• 14. In ABC, we know that B & # 178; - C & # 178; = A & # 178; + AC, then B =? A. 45 ° B, 120 ° C, 30 ° or 150 ° D, 60 ° or 120 ° C
• 15. In △ ABC, B & # 178; = AC, B = 60 °, then a
• 16. In △ ABC, if B = 60 °, B & # 178; = AC, then C=
• 17. It is known that the three sides a, B and C of △ ABC satisfy A2 + B2 + C2 = 10A + 24B + 26c-338. Please judge the shape of △ ABC and explain the reason
• 18. In △ ABC, if C = 60 ° and C2 = AB, then the shape of triangle is () A. Right triangle B. isosceles triangle C. equilateral triangle D. obtuse triangle
• 19. In the triangle ABC, if a: B: C = 7:8:13, then the cosine of the largest inner angle in the triangle is
• 20. In △ ABC, if a = 7, B = 8, COSC = 1314, then the cosine of the largest angle is () A. −15B. −16C. −17D. −18