Answer
See the picture below:
![](https://gradesaver.s3.amazonaws.com/uploads/solution/5264a512-4f2d-4b16-8a92-852227d55841/result_image/1502569338.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240727%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240727T015320Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=a746d7db4685f8900bad48ec7161c13209310457cb445798304c97d9990eb0e7)
Work Step by Step
By using a compass mark an arc with the center of O to intersect the two sides of line $\overline{OA}$. Now with those two points as centers, mark off two arcs with equal radii to intersect in point R. Connect this point with O to get the right angle.