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.
Special Right Triangles. 30-60-90 Triangles. An equilateral triangle is a triangle with all sides congruent. From the Isosceles Triangle Theorem if follows that the angles of an equilateral triangle are all the same. Since the angles of any triangle add to 180 o, each angle of an equilateral triangle must be 60 o.n equilateral triangle is a triangle with all sides congruent. From the Isosceles Triangle Theorem if follows that the angles of an equilateral triangle are all the same. Since the angles of any triangle add to 180 o, each angle of an equilateral triangle must be 60 o.