Question

In a quadrilateral the three angles are 70 , 80, 90 then the fourth angle is

Answer 1

fourth angle is equal to 360 degree minus 240 degree is equal to 120 degree

Answer 2

Given:-

• Three angles of a quadrilateral are 50°, 70°, 90°

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:-

$\longrightarrow50° + 70° + 90° + x = 360° \\ \\\longrightarrow 210° + x = 360° \\ \\\longrightarrow x = 360°- 210° \\ \\ \longrightarrow \dag { \boxed{ \underline{ \rm{ \blue{x = 150°}}}}}$

Hence, the measure of fourth angle is 150°.