= 1.5* 1.5*π-0.64
=2.25π-0.64
The third is the multiplication of three (2.25π-0.64).
6.75π- 1.92
If π is equal to about 3. 14.
The first one is 7.065-0.64=6.425.
The second one is 21.195-1.92 =19.275.