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. c

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Page 1: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

Page 2: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

What is a circle?

A circle is a set of points equidistant from a fixed point, called the centre.

Page 3: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

CircumferenceThe length round a circle. It is a special name for the perimeter of a circle.

c

Page 4: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

ArcOne of the two parts between two points on a circumference

Arc

Page 5: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

RadiusThe distance from the centre of a circle to its circumference. The plural of the term is radii.

r

Page 6: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

DiameterThe distance across a circle through its centre. The diameter, d, of a circle is twice its radius, r, so d=2r

d

Page 7: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

ChordA straight line which joins two points on the circumference of a circle

Chord

Page 8: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

SegmentThe region of a circle enclosed by a chord and an arc.

ChordArc

Segment

Page 9: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

Tangent

A straight line that touches a circle at one point only on the circumference.

Tangent

Page 10: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

SectorA portion of a circle enclosed by 2 radii and one of the arcs between them.

Sector

Page 11: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

SemicircleOne half of a circle. It can be either of the parts cut off by the diameter.

Semicircle

Page 12: DH2004. What is a circle? A circle is a set of points equidistant from a fixed point, called the centre

DH2004

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