Question

how can we create angles from compass

Answer 1

Try doing bisectors with compass the bisector is the exact half

Answer 2

Step 1: Draw the arm PQ.

Step 2: Place the point of the compass at P and draw an arc that passes through Q.

Step 3: Place the point of the compass at Q and draw an arc that passes through P. Let this arc cut the arc drawn in Step 2 at R.