Question

Pls help, find the missing angle values

Answer 1

`b=90^o\\\\a+b+72^o=180^o\ \ \ \ [\mathrm{Sum\ of\ angles\ of\ straight\ line\ is\ 180^o.}]\\\mathrm{or,\ }a+90^o+72^o=180^o\\\mathrm{or,\ }a=18^o\\\\a+b+c+72^o=360^o\ \ \ \ \ [\mathrm{These\ angles\ make\ a\ complete\ turn,\ 360^o.}]\\\mathrm{or,\ }c+180^o=360^o\\\mathrm{or,\ }c=180^o`