measurement of a circle
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The formula for finding the circumference of a circle is π⋅diameter=2⋅π⋅radiusπ⋅diameter=2⋅π⋅radius
The formula for finding the area of a circle is π⋅radius2π⋅radius2
The standard notation for a radius is r, for a diameter - d, for a circumference - P and for area A.
P=π⋅d=2⋅π⋅rP=π⋅d=2⋅π⋅rA=π⋅r2
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