$\alpha ={180}^o-{138}^o={42}^o$

$\beta ={180}^o-\left({52}^o+{80}^o\right)={180}^o-{132}^o={48}^o$

$\gamma ={180}^o-{90}^o-{65}^o={90}^o-{65}^o={25}^o$

$\delta ={180}^o-\left({35}^o+{38}^o+{38}^o\right)={180}^o-{111}^o={69}^o$