The angles of a triangle are in the ratio $2:3:4$. Then the angles in radian measure is

$2x+3x+4x=180°$

$9x=180°\Rightarrow x=20°$

$40°,60°,80°$

$\frac{D}{90°}=\frac{2C}{\pi }\Rightarrow \frac{40°}{90°}=\frac{2C}{\pi }$

$\Rightarrow 40°=\frac{2{\pi }^c}{9}$

$60°\Rightarrow \frac{D}{90°}=\frac{2C}{\pi }\Rightarrow \frac{60°}{90°}=\frac{2C}{\pi }\Rightarrow 60°=\frac{{\pi }^c}{3}$

$80°=\frac{80°}{90°}=\frac{2C}{\pi }\Rightarrow 80°=\frac{4{\pi }^c}{9}$