Number added to a code (such as a bar code or account number) to derive a further number as a means of verifying the accuracy or validity of the code as it is printed or transmitted.
An equilateral triangle has the following properties. 1  Equilateral triangles have three equal side lengths. 2  Equilateral triangles also have three equal angles of 60 degrees. 3  They also have three equal altitudes.  Is the height of an equilateral triangle equal to its side 1  length. The height is equal to side/2 x  â3.
Triangles can be classified according to the relative lengths of their sides: 1  In an equilateral triangle, all sides are the same length. 2  An equilateral triangle is also a regular polygon with all angles 60Â°. 3  In an isosceles triangle, at least two sides are equal in length.