A straight line passing from side to side through the center of a circle or sphere.
Archives: Glossary
A dilation is a stretch or a shrink in the size and location of a figure or point. The scale factor in a dilation is the amount by which the figure is stretched or shrunk. The centre of dilation is a reference point used to appropriately scale the dilation of a figure.
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.
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.