A quadrilateral shape has angles of 60, 75, and 105 degrees. How many degrees is the fourth angle?

All interior angles in a quadrilateral add up to 360 degrees. Adding up what we know so far 60 + 75 + 105 = 240. So the fourth angle must be 360 - 240 which equals 120 degrees.

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Answered by Priti B. Maths tutor

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