dh2004. what is a circle? a circle is a set of points equidistant from a fixed point, called the...
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DH2004 Circumference The length round a circle. It is a special name for the perimeter of a circle. cTRANSCRIPT
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DH2004
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DH2004
What is a circle?
A circle is a set of points equidistant from a fixed point, called the centre.
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DH2004
CircumferenceThe length round a circle. It is a special name for the perimeter of a circle.
c
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DH2004
ArcOne of the two parts between two points on a circumference
Arc
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DH2004
RadiusThe distance from the centre of a circle to its circumference. The plural of the term is radii.
r
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DH2004
DiameterThe distance across a circle through its centre. The diameter, d, of a circle is twice its radius, r, so d=2r
d
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DH2004
ChordA straight line which joins two points on the circumference of a circle
Chord
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DH2004
SegmentThe region of a circle enclosed by a chord and an arc.
ChordArc
Segment
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DH2004
Tangent
A straight line that touches a circle at one point only on the circumference.
Tangent
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DH2004
SectorA portion of a circle enclosed by 2 radii and one of the arcs between them.
Sector
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DH2004
SemicircleOne half of a circle. It can be either of the parts cut off by the diameter.
Semicircle
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Test