A rhombus has two lines of symmetry because two lines pass through the corners of a rhombus. There are some properties of rhombus which are as follows: Base – In a rhombus we can assume as a base of rhombus. If we want to find the area of a rhombus then we have to use the Altitude of a rhombus. Altitude – The perpendicular distance from the base to the opposite side of a rhombus is altitude of a rhombus.