1)make a line.
2)mark a point A on the line.
3)taking point A as center draw a semicircle.
4)with same radius draw make an arc by taking the p of inter s. as center.
5)by taking point of inter s. of arc as center draw another arc.
7)you will get 45 angle.
8)bisect it you will get 22 1/2 degree angle.
hope it helped.
pls mark as brainliest.