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.
PROPERTIES OF TRIANGLES AND QUADRILATERALS. Types of triangles. Triangles can be classified in various ways, based either on their symmetry or their angle properties. An equilateral triangle has all three sides equal in length, and all three angles equal to 60Â°. An isosceles triangle has two sides equal, and the two angles opposite the equal sides also the same. Thus in the diagram, angle A = angle C. A scalene triangle has all three sides and angles different. All triangles have an interior angle sum of 180Â°.