Geometric Construction
9 Divide a Circle Into 12 Equal Parts
- Draw an x-y axis.
- Draw a circle.
- From each quadrant point, swing the radius in both directions to cross the circumference. (Remember, when we swing the radius along an arc of equal distance, we create 60°.) As we do it both ways, we end up with 30°-60°-90° all the way around the circumference.
This is one of the most common techniques we use. Know it well!!!
definition
a sector which equals one quarter of the area of a circle
the distance from center to any point of the circumference, half the diameter
the distance around a circle, perimeter of a circle
a portion of a circumference
