Angle
Represents any angle.


Position Represents the x (horizontal) & y (vertical) coordinates of a point.


Circle; Circular
Represents that the object referred to is circular.


Concentric circles
Represents that the circles referred to share a common centre point.


Diameter
Represents that the line referred to is the diameter of a circle.


Parallel to
Represents that the lines referred to are parallel in the same plane.


Parallelogram
Represents that both sets of opposing sides of a four sided plane figure (quadrilateral) are of equal length, and has both sets of opposite angles equal.


Perpendicular to
Represents that the intersection of two lines are at 90º, also described as being perpendicular.


Quadrant
Represents that the area referred to is a quadrant of a circle. A quadrant is the portion of a circle that has an included angle of 90º.


Radius
Represents that the line referred to is a radius of a circle. A radius is the line from a centre of a circle to any point on the circumference.


Right angle triangle Represents that the triangle referred to is a "right angled" triangle". A right angle triangle has one angle at 90º.


Semicircle
Represents that the arc referred to is exactly half of the circumference of a circle.


Semicircular Rule
Used to represent that the angle created at the vertex of two lines drawn from either end of the diameter of a circle have an included angle of 90º (a right angle).


Symmetrical; Symmetry
Represents that the objects referred to are symmetrical about an axis.


Tangent to
Represents that the line referred to in tangental and only intersects the circumference of the circle at one point. The angle formed at the intersection of the tangent line and a radius line from the circle is a right angle (90º).

