Generate and Apply Formula of Circumference
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
d Diameter equals to two radius (radii)
Area of Circles
Area. It is the surface space inside a figure.
Keywords: Painting, cutting grass, putting tiles.
CI01 Circle Circumference and Area 1
CI03 Circle Circumference and Area 2
CI04 Find diameter given circumference
CI05 Find radius given area
Review: Area, Perimeter, & Circumference.
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