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- Essential Figures — continued
Circles:
Characteristic Notes
The distance from the center
to any point on the circle is
the (length of the) radius, r...
- Area = πr2
- Circumference = 2πr
- diameter = 2r
- Fundamental Formula Exercises:
- Perimeter & Area of a Trapezoid
- Circumference & Area of a Circle
- Additional Units of Area Measure:
- acre (a) = 43,560 ft2
- hectare (ha) = 10,000 m2
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