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.
1 An equilateral triangle has all its angles measuring 60Â°. 2  So, the angles of an equilateral triangle are congruent. 3  A square and a rectangle have all their angles measuring 90Â°. 4  So, the angles of a square and a rectangle are congruent. 5  Congruent Figures have the same shape and size.