A plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.
Glossary Term: Definitions
A list of geometrical definitions and postulates.
An equilateral triangle has sides of equal length. All its three angles are 60 degrees.
An excircle or escribed circle of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions of the other two.
If something is divided in two parts such that the proportion of the smaller part to the larger equals the proportion of the larger to the whole.
The height of a polygon is the perpendicular distance of the base to the furthest corner.
A polygon with six sides
A hyperbola is a set of points whose difference of distances from two foci is a constant value.
The hypotenuse is the longest side in a right triangle. It lies opposite the right angle.
The point of a triangle where the three angle bisectors cross. It is equidistant from all the sides. It is also the centre of the inscribed circle.
The incircle or inscribed circle of a triangle is the largest circle that can be contained in the triangle