To divide a circle into 9 equal parts, you can either use your compass or protractor for the division. Here I’ll be explaining using a protractor:
Step 1: Draw the given circle
Step 2: Draw a radius to the circle. That is a line from the center to any point on the circumference
Step 3: Use your protractor to mark 40o interval start from the radius. That means on your compass, you’ll mark 40o, 80o, 120o, 160o, 200o, 240o, 280o, 320o, 360o.
Step 4: From the center of the circle, draw a line to touch those points. Note; depending on the size of the circle and the protractor used, your point might not be directly on the circumference. Make sure the lines dividing the circle touch the circumference.
Below is a video guide illustrating how to properly divide a circle into nine equal sectors:
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