A circle cut in half along its diameter.
Glossary Term: Definitions
A list of geometrical definitions and postulates.
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.
A three-dimensional object having four triangular faces, six straight edges and four vertices.
Invariance of an object if translated or slided.
A quadrilateral with at least one pair of parallel sides. Also known as trapezoid.
A circle with radius 1.
An object that has a magnitude (length) and direction. Vector algebra is widely used in physics.
A point where two lines, curves or edges meet.