Question

in a quadrilateral ABCD, the measure of the three angles, ABC of the quadrilateral is A=110 B=70 D=80 so find the measure of C​

Answer 1

Answer:

Given ABCD is a quadrilateral

Sum of all angles in a quadrilateral is 360°

Angle A + Angle B + Angle C + Angle D = 360

Assuming angle C as x

110 + 70 + x + 80 = 360

260 + x = 360 ( sending + 260 to right hand side it becomes - 260)

X = 360 - 260

X = 100