Question

two angles of a quadrilateral are of measure 80 each and the other two angles are equal what is measure of these two angles

Answer 1

ANSWER
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Two angles are already given to be 80° and it is given that the other two angles are equal

We know that the sum of all the angles of a quadrilateral is equal to 360 degree

Hence an equation can be formed taking the equal and unknown angles to be x

The equation formed will be :

80 + 80 + x + x = 360°

160 + 2x = 360

2x = 200

x = 100

So each unknown angle is equal to 100 degree.

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Answer 2

80+80=160

the sides of a quadrilateral measure 360degree

so, 360-160=200

angles we find =2

2x = 200

x= 200/2

= 100

this is the best answer