Respuesta :

HajirahBibi
The sum of all the angles in a trapezoid/trapezium is 360°.

90° + 60° + 150° + 3x = 360°

300° + 3x = 360°

3x = 360° - 300°

3x = 60°

x = 60°/3

x = 20°

Hope this helps!
icerina006

Answer:

3x=60°

Step-by-step explanation:

3x°+90°+60°+150°=360°

3x°+300°=360°

3x°=60°

x=20°

3x=20×3=60°