The formula of an area of a rhombus:
[tex] A=\dfrac{diagonal_1\cdot diagonal_2}{2} [/tex]
The diagonals bisect each other. That is, they divide each other into two equal parts.
Therefore we have:
[tex]diagonal_1=2\cdot1.2m=2.4m\\\\diagonal_2=2\cdot0.9m=1.8m[/tex]
Substitute:
[tex]A=\dfrac{2.4\cdot1.8}{2}=2.16\ m^2[/tex]
Answer: 2.16 m²
