Question

The three angles of a Quadrilateral are 80⁰, 70⁰ ,120⁰ .The fourth angle will be​

Answer 1

Answer:

Formula = 1+2+3+4 =360

80+70+120+x = 360

x = 360 - 270

x = 90

So Fourth Angle Will Be 90°

Answer 2

Given:-

Three angles of a quadrilateral are 80°, 70°, 120°

To Find:-

Fourth angle of quadrilateral?

Solution:-

$\Longrightarrow \dag$ As we know the sum of all angle of a quadrilateral is 360°.

Let the fourth angle be 'x'

50° + 70° + 90° + x = 360°

Now, according to the question:-

$\longrightarrow80° + 70° + 120° + x = 360° \\ \\\longrightarrow 270° + x = 360° \\ \\\longrightarrow x = 360°- 270° \\ \\ \longrightarrow \dag { \boxed{ \underline{ \rm{ \blue{x = 90°}}}}}$

Hence, the measure of fourth angle is 90°.