geometry help

Some of these letters are easy to find so what have you found so far ?

"y" =  180 - 131   = 49°   = the vertical angle to y at the bottom left of the top triangle

The angle supplemental to the 142° angle = 180 - 142  = 38°

So "w"  =  180 - 49 - 38  = 93°

By the interior angle theorem, the angle at the bottom right of the top triangle = 93 - 42  = 51°

So..  "t"  will =   180 - 49 - 51   =  80°