Question

In a quadrilateral ABCD, the measure of the three angles A, B
and C are 110°, 70° and 80°, respectively.
Find the measure of the fourth angle.

Answer 1

Answer:

sum of all side sof a quadrilateral is 360

110+70+80+x=360

x=360-260

x=100 degree

Answer 2

Answer:

∠A= 110 , ∠B = 70 , ∠C = 80 , ∠D = ?

WE KNOW THAT the in a quadrilateral sum of all angles is 360°

now , ∠A+∠B+∠C+∠D= 360°

 110°+ 70°+ 80°+ ∠D= 360°

260 °+ ∠D = 360°

∠D = 360 - 260

∠D= 100°

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