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The RADIUS.

Other nomenclature for a circle are:-

Diameter ; Two radii forming a straight line through the circle centre.

Chord ; A straight line from one point on the circle to another point on the circle that does NOT pass through the circle centre.

Arc ; Part of the circumference.

Segment ; An area inside the circle bounded by two radii and an arc.

Tangent ' A line just touching the circle's circumference in ONE place.

NB The plural of the noun 'Radius' is 'RADII' , not radiuses.

'Radii' is pronounced 'Ray- dee - eye'.

NNB 'pi' is the Classical Greek small case letter 'p' , for 'proportion. It is an Irrational number, but for elementary(school) purposes it is given as the approximation '3.14' or '22/7'

Being an Irrational number means the decimals are NOT in any regular order and go to infinity. pi ~ 3.141592.....

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lenpollock

Lvl 16
2y ago

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