Rhombus and a square have one and the same side of 6 cm. The area of the rhombus is 4/5 of the area of the square. Find the height of the rhombus.

Consider this option:

1. area_rombus=a*h, where a=6 - the length of the side, h - height.

h=area_rombus/a.

2. area_sq=a², where a=6 - the length of the square.

area_sq=36, area_rombus=4/5 * 36=28.8.

3. according to the item 1 h=area_rombus/a=28.8/6=4.8.

answer: 4.8