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PARTS OF A CIRCLE
PARTS OF A CIRCLE
The main parts of a circle in maths include the centre, radius, diameter, circumference, arc, chord, secant, tangent, sector, and segment.
Centre: The central point of the circle from which all points on the circle are equidistant.
Radius: A line segment from the centre of the circle to any point on the circumference.
Diameter: A line segment that passes through the centre of the circle and has endpoints on the circumference; it's twice the length of the radius.
Circumference: The total distance around the circle.
Arc: A portion of the circumference of the circle.
Chord: A line segment that connects two points on the circumference of the circle.
Secant: A line that intersects the circle at two points.
Tangent: A line that intersects the circle at exactly one point (the point of tangency).
Sector: The area enclosed by two radii and the arc between them.
Segment: The area enclosed by a chord and the corresponding arc.
PI
PI
The Greek letter for p, or π (pi) - is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will always equal pi.
In decimal form, the value of pi is approximately 3.14.
Massimo Mercedes in Year 10 is the current holder of knowing most numbers in pi - he remembered 261!
International Pi Day is March the 14th!
CIRCUMFERENCE and area OF A CIRCLE
CIRCUMFERENCE and area OF A CIRCLE
In order to work out the circumference of a circle (the outside measurement of a circle), you use the formula C=2πr, where C = circumference, 2 x π x r = radius OR C=πd, where C = circumference, π x d = diameter.
In order to work out the area of a circle (the inside space of the circle), you use the formula A=πr2, where A = area, π x r = radius and then squared on your calculator.
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