114

a)
1°=\frac{\pi}{180}\approx0{,}01745...\approx0{,}02
-1234°=-1234\cdot\frac{\pi}{180}=-21{,}5373...\approx-21{,}54
-330°\approx-5{,}7595...\approx-5{,}76
720°\approx12{,}57
18°\approx0{,}31