Question

Determine, em radiano, a medida dos arcos de:a) 45° b) 180°

Answer 1

 a)
45°

π ⇒ 180°
x  ⇒ 45°

$x= \frac{ \pi .45}{180} ~~~simplificando~~ \frac{45:45}{180:45} = \frac{1}{4} \\ \\ x= \frac{ \pi }{4} \\ \\ 45^{\circ}\mapsto \frac{ \pi }{4} rad$ 

b)

180° ⇒ π rad