Question

if three angle of a quadrilateral are 60 , 90, and 120 . Find the fourth angle

Answer 1

Answer:

Step-by-step explanation:

All angles of a quadrilateral = 360 degrees

So, 60+90+120+x= 360

270+x=360

x= 90 degrees

Answer 2

Given : Three angles of a quadrilateral are 60° , 90°, and 120°

To find : The fourth angle of the quadrilateral.

Solution :

We can simply solve this mathematical problem by using the following mathematical process. (our goal is to calculate the fourth angle of quadrilateral)

Now, we know that,

The sum of four angles of a quadrilateral = 360°

So, in case of the given quadrilateral,

60° + 90° + 120° + Fourth angle = 360°

Fourth angle + 270° = 360°

Fourth angle = 360° - 270°

Fourth angle = 90°

(This will be considered as the final result.)

Hence, the fourth angle of the quadrilateral is 90°