No because a triangles inner angles must equal a whole 180 degrees and an equilateral has to have all equal interior angles and 75+75+75 does not equal 180
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No because the 4 interior angles must add up to 360 degrees
105
30
The sum of an angle and its complement is 90 degrees. So the unknown angle must be 90 - 75 = 15 degrees.
360 - 75 = 285