Question

how can I change a semicircle in circle without drawing and without pencil.​

Answer 1

Answer:

Use you little finger as a pivot and rotate the apper underneath.

Draw the circle using a paper clip.

Tie the ends of 2 pencils using a rubber-band and draw it like a compass.

Create an adjustable compass using 3 pencils.

Use your index finger to mark the center of the circle and rotate the paper.