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.
Lancashire Mathematics Team equilateral triangle All three sides of an equilateral triangle are the same length and all the angles are equal at 60Â°. isosceles triangle An isosceles triangle has two equal sides and two angles that are equal. square A square is a special type of rectangle.ancashire Mathematics Team equilateral triangle All three sides of an equilateral triangle are the same length and all the angles are equal at 60Â°. isosceles triangle An isosceles triangle has two equal sides and two angles that are equal. square A square is a special type of rectangle.