For simplicity, you can think of this as a “pizza slice” shape:Ī segment is the region bounded by a chord and an arc:Įxpanding on this, there are three laws of circle geometry (pertaining to angles) that you should be aware of.įirstly, a tangent to a curve at a given point is a straight line which “just touches” the curve at that point and no more. It is small section of the circle’s overall area. the diameter is a special chord):Īn arc is any small section of the circumference of a circle:Ī sector is the region bounded by two radii and an arc. If the line passed through the centre, it would be a diameter (i.e. The circumference is the distance around the edge of a circle (in non-curved shapes, this is called the perimeter):Ī chord is any line connecting two points on a circle’s circumference that does not pass through the centre of the circle. ![]() A circle’s diameter is always double the length of its radius: The diameter is any straight line passing through the centre of a circle whose ends both touch the circle’s circumference. The radius is any straight line going from the centre of a circle to any point on its circumference: It is useful to recall the definitions of various aspects of a circle’s geometry: This affects the geometry of the shape quite considerably and gives circles some unique characteristics. Of all the standard 2-D shapes we work with at National 5 level, the circle is the only one with curved edges.
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