$a)\alpha ={128}^o$  

$b)\alpha ={180}^o-{38}^o={142}^o$ $b)\alpha ={180}^o-{38}^o={142}^o$

$c)\alpha ={78}^o$  

$d)\alpha ={55}^o$  

$e)\alpha ={180}^o-{45}^o={135}^o$  

$f)\alpha ={180}^o-{130}^o={50}^o$