Draw a ray.

(2) The center of the protractor coincides with the endpoint of the ray. The "0" scale line coincides with the ray. Start from the "0" scale line at the end of the light, count to the degree to be drawn, and point a point on the degree scale.

(3) Draw a ray from the end of the ray through the dot just drawn.

④ Finally, mark the symbol and degree of the upper corner.

Elementary school mathematics, corner painting (corner painting) knowledge points.