6.Find the area of a rhombus whose side is 5 cm and whose altitude is 4.8 cm. If one of its diagonals is 8 cm long, find the length of the other diagonal.
We know, area of the rhombus = $$Side \times Altitude = 5 \times 4.8 = 24 cm^2$$
Area of the rhombus =$$\frac { 1 }{ 2 } \times d1 \times d2$$
$$\Rightarrow 24 = \frac { 1 }{ 2 } \times 8 \times d2$$
$$\Rightarrow 24 = 4\times d2$$
$$\Rightarrow d2 = 6 cm$$