A line that intersects a curve (mostly a circle) at a minimum of two distinct points.
Archives: Glossary
A circle cut in half along its diameter.
Two objects are similar of they have the same shape, but not necessarily the same size.
The line that touches a curved two-dimensional object, such as a circle, in just one point. A tangent to point on a circle is perpendicular to the radius to that tangency point.
The angle formed between a chord and a tangent line to a circle is equal to the inscribed angle on the other side of the chord.
A circle tangent and secant intersect at a point P. If T is the tangency point and A and B are the secant’s intersection points with the circle, we have |PA|*|PB|=|PT|2
If two lines from the same point are both tangent to a circle, then the line from the point to the centre of the circle bisects the angle formed by the two tangents, and the point is equidistant from the two points of tangency.
A three-dimensional object having four triangular faces, six straight edges and four vertices.
The angle formed by connecting a diameter and another point on the circle is a right.
Invariance of an object if translated or slided.