Ratio a) 1:2:2 b) 1: 13:2 c) 77 +1:17: 20. In AABC if a² +62 +c2 = ca +ab/3, then the triangle is a) equilateral b) right angled isosceles c) right angled with A = 90°, B = 60°C = 30° d) obtuse angle 21. In AABC, if cos A cos B+sin Asin B sin C = 1, then the trianglei a) equilateral

Ratio a) 1:2:2 b) 1: 13:2 c) 77 +1:17: 20. In AABC if a² +62 +c2 =

1.	Ratio a) 1:2:2 b) 1: 13:2 c) 77 +1:17: 20. In AABC if a² +62 +c2 = ca +ab/3, then the triangle is a) equilateral b) right angled isosceles c) right angled with A = 90°, B = 60°C = 30° d) obtuse angle 21. In AABC, if cos A cos B+sin Asin B sin C = 1, then the trianglei a) equilateral
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