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Draw a straight line that bisects the circle and passes through the center.
Construct a circle with a compass and then draw a straight line through its centre
Draw one square, and draw one circle. Find the center in each, and draw one straight line vertically. Then find the middle once more but this time draw a line straight through horizontally. You have four equal parts in each shape.
The hands of the clock will form a straight line 12 times.
One can draw a straight line by using a ruler. Should a ruler not be available, one can use the edge of a book or another piece of paper to guide the line straight.