/Sandbox
α = arctan ( a b ) {\displaystyle \alpha =\arctan({\frac {a}{b}})} a 2 + b 2 = c 2 {\displaystyle a^{2}+b^{2}=c^{2}} c = a 2 + b 2 {\displaystyle c={\sqrt {a^{2}+b^{2}}}}