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# Math 6: Unit 11

### Formulas

TermDefinition
Pi The ratio of the circumference of a circle to its diameter.
Radius The distance from the center of a circle to the edge.
Diameter A straight line passing through the center of the circle and touching both sides.
Circumference The distance around a circle.
Triangle A polygon with 3 angle and 3 straight sides.
Rectangle A quadrilateral with 4 right angles and two pairs of opposite parallel sides.
Area The size that a surface takes up.
Perimeter The distance around the outside of a shape.
Created by: PRO Teacher scash