Question

Two angles of quadrilaterals measure 80º and 60º respectivly. The other two angle are equal. Find the measure of each of these equal angles.​

Answer 1

Answer:

Let the equal angles be x degrees each

We know sum of all angles in a quadrilateral is 360 degrees

So, 80 + 60 + x + x= 360

140+2x=360

2x =  360-140

2x = 220

x = 110

Therefore, the measure of the equal angles are 110 degrees each

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Answer 2

Answer:

Each angle of 120°.

Step-by-step explanation:

Given: two angles of a quadilateral, which are 80° and 60°.

To find: other two angles of the quadilateral.

Solution: let each angles be x.

we know, sum of four angles of a quadilateral =360°.

so, 80°+60°+x+x=360°

Or, 140°+2x=360°

Or, 2x= 360-140

Or, 2x= 240

Or, x=240/2

Or, x=120.

So, each angle will be of 120°.