Question

please answer my question​

Answer 1

$\large\pink{\sf{i.20}}$

$\large{\sf{=~90~-~20}}$

$\large{\sf{=~70°}}$

$\large\pink{\sf{ii.~45°}}$

$\large{\sf{=~90~-~45}}$

$\large{\sf{=~45°}}$

$\large\pink{\sf{iii.~70°}}$

$\large{\sf{=~90~-~70}}$

$\large{\sf{=~20°}}$

$\large\pink{\sf{iv.~50°}}$

$\large{\sf{=~90°~-~50°}}$

$\large{\sf{=~40°}}$