Question

if the 3 angles of a qyadiretral are 69 degree and 98degree and 129degree then find the 4th angle​

Answer 1

Sum of angles of quadrilateral=360°

Given angles are 69°,98°&129°

Required angle=360-(69+98+129)

=360-296. =>. 64°

Answer 2

$\mathtt{ \purple{ \huge \underline{\fbox{ \orange{\: Solution \red: \: \: }}}}}$

Given ,

The three angles of quadrilateral are 69 , 98 and 129

Let ,

The other angle be x

Therefore ,

$\sf \hookrightarrow 69 + 98 + 129 + x = 360 \: \: \: \: \bigg\{ \because Angle \: sum \: property \bigg\} \\ \\\sf \hookrightarrow 296 + x = 360 \\ \\\sf \hookrightarrow x = 64$

Hence , the fourth angle is 64°