# Circle

Generate and Apply Formula of Circumference

# Pi (π)

By definition, π is the ratio of the circumference of a circle to its diameter.

The relationship between the circumference and diameter  of a circle

Measure the circumference and diameter of circular objects. Find the ratio of circumference to diameter for each object.

Ratio Relationship of π=C/d

Circumference. It is the distance around a circle.  Keywords: fencing, framing, edge, border.

C = π d                        C = 2 π r

π (Pi) Could be 3.1416,   or 3.14,  or  22/7,   or 3 if it is an approximation.
Approximately 3 diameters equal to the circumference of the circle.

r          Radius is half of the diameter

Area of Circles
Area.  It is the surface space inside a figure.
Keywords:   Painting, cutting grass, putting tiles.

### CI07       Semicircle

Circle_W   Circle Vocabulary

Circle_Help

### Review: Area, Perimeter, & Circumference.http://ec2-52-33-158-168.us-west-2.compute.amazonaws.com/MiniQuizzes/Help/Circle_Help.htmMs. Garcia Book, Practice Exercises:

AREA:

Area

Area of Circles 1

Area of Circles 2

Area of Part Circle 1

Area of Part Circle 2

Area of Part Circle 3

Area of Part Circle 4

Area of Part Circle 5