What are the 12 parts of a circle?

What are the parts of a circle? The parts of a circle are the radius, diameter, circumference, arc, chord, secant, tangent, sector and segment.

thirdspacelearning.com - Parts Of A Circle - GCSE Maths - Steps, Examples & Worksheet

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What are the parts of a circle?

The parts of a circle are the radius, diameter, circumference, arc, chord, secant, tangent, sector and segment.

Circle terms

Naming circle parts:

Circle

A round plane figure whose boundary consists of points equidistant from a fixed point.

Centre

The centre of the circle is the fixed point from which all points on the boundary of the circle are equidistant.

Often noted on diagrams as ‘O’.

Centre/center are the same. Centre is the UK spelling whilst Center is the US spelling.

Radius

The distance from the centre of a circle to the outside.

The radius of the circle is half the diameter of the circle.

The plural of radius is radii.

Diameter

The distance across the circle going through the centre.

The diameter is twice the radius.

Circumference

The distance once around the circle.

Arc

A part of the circumference.

Major arc – A major arc is greater than half the circumference.

Minor arc – A minor arc is less than half the circumference.

Area

The space inside a 2D shape.

Chord

A line segment going from one point of the circumference to another but does not go through the centre.

Secant

A line that goes through the circle at two points.

Note: Secant is not a term you are required to know at GCSE, however it is important to note the difference between a chord and a secant.

Tangent

A straight line that touches the circle at a single point only.

Sector

A section of the circle created by two radii.

Major sector – A major sector has a central angle which is more than 180^o . Minor sector – A minor sector has a central angle which is less than 180^o .

Semi circle

Half of a circle. Could be considered a sector where the circle has be split by the diameter.

Quadrant

A quarter of a circle, created by two perpendicular radii.

Segment

A section of the circle created by a chord.

Major segment – a segment where the arc is greater than half the circumference. Minor segment – a segment where the arc is less than half the circumference.

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How do I remember music notes?

The note names on the spaces of the treble clef spell out F-A-C-E. The note names on the lines of the treble clef are E-G-B-D-F. Some mnemonics to help you remember this are “Every Good Boy Does Fine”, “Every Good Boy Deserves Fudge”, or “Elvis's Guitar Broke Down Friday”.

blog.sheetmusicplus.com - Learn How to Read Sheet Music: Notes for Music | Take Note

! D O C T Y P E h t m l P U B L I C " - / / W 3 C / / D T D X H T M L 1 . 0 T r a n s i t i o n a l / / E N " " h t t p : / / w w w . w 3 . o r g / T R / x h t m l 1 / D T D / x h t m l 1 - t r a n s i t i o n a l . d t d " >

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