Question

the three angle of a quaridatral measure 40,120 and 100 find the fourth angle​

Answer 1

Answer:

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Step-by-step explanation:

We know that sum of all angles in a quadrilateral is 360 °

So

40° + 120° + 100° + x° = 360°

260° + x° = 360°

∴ x° = 360°- 260°

∴ x° = 100°

Hence. measure of 4th angle is 100°

Answer 2

Step-by-step explanation:

as we know that the measure of all the four angle are 360°.

suppose the fourth angle to be x.

360= 40+120+100+x

360=160+100+x

360=260+x

260-360=x

100=x or

x=100