The following are angles in a convex quadrilateral:
Angle A = 80 degrees
Angle B = 98 degree
Angle C = 70 degrees
What is the measure of the missing angle?
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The sum of the interior angles of a quadrilateral is 360 degrees.
An interior angle of a convex heptagon can have any value in the range (0, 180) degrees.
Hmmm... how bout 360 degrees ?
Yes, the angle sums will be the same regardless of whether or not it is a convex polygon.
The interior angles of a quadrilateral always add up to 360 degrees. Therefore, 68+51+116=235 360-235=125 degrees.