Question

Determine a medida em radiano equivalente a 45°

Answer 1

$\dfrac{ \alpha }{180} = \dfrac{x}{ \pi \ rad} \\ \\ \\ \dfrac{45}{180} = \dfrac{x}{ \pi \ rad} \\ \\ \\ 180x = 45 \ \pi \ rad \\ \\ \\ x = \dfrac{45}{180} \ \pi \ rad \\ \\ \\ x = \dfrac{1}{4} \ \pi \ rad$

Answer 2

π  ⇒ 180°
x  ⇒ 45°

$x= \frac{45 \pi }{180} \\ \\ x= \frac{ \pi}{4} ~rad$