Question

Solve no. 6 ...........

Answer 1

If triangle ABC is an equilateral triangle then angles A, B and C are all 60 degrees.
IN triangle BDC, angle D = 90 degrees
So, angles B and C will both be = (180 - 90)/2
                                                   = 90/2 = 45 degrees each.
So, angle ACD = 60 + 45 degrees = 105 degrees

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