There is no mixed number for the three shapes.
2 rhombuses and 2 triangles
2
2 and 1 half
2 rhombuses
It is a hexagon.
There are 4 triangles in a 6 sided hexagon
It is: 2 and a 1/2 as a mixed number
trapezoids have 4 sides, rhombuses have 4 sides
Diagonals in an hexagon: 0.5*(6^2 -3*6) = 9 diagonals
The total number of diagonals for a convex (or concave) polygon, a hexagon being of the former type, is given by the equation (n2 - 3n)/2, where n is the number of sides of the polygon. A hexagon has 6 sides, so plugging the number 6 into the above equation for n, one finds that a hexagon has: [62 - 3(6)]/2 = (36 - 18)/2 = 18/2 = 9 diagonals.
if you are asking "what is 3 and 1/2 as a mixed number", the answer is that it already is in mixed number format.
7