Question

9) For equilateral triangle for turpentine is 420 23 for this angle of incidence angle of refrection will be a) 42° 23 b) 90°c) 50°12 d) 70°​

Answer 1

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This triangle is equilateral; we can tell because each of its sides are the same length, a. To find the length of one side, we need to divide the perimeter by 3: