Question

contente -400° Em radiano

Answer 1

180º------------------π rd
-400º----------------- x rd

x = -400.π /180 =- $\frac{20 \pi }{9}$

Answer 2

$-400^o=40^o\\ \\ 180^o ---------- \ \pi \ rad\\ 40^o ------------ \ x\\ \\ x=\frac{40\pi}{180}=\frac{2\pi}{9} \ rad$