Answer:
a. The triangular prism has 5 faces, 9 vertices, and 12 edges.
b. To find the volume of the packaging, we need to multiply the area of the base (an equilateral triangle) by the height of the prism.
The area of an equilateral triangle with side length 3.6 cm is given by:
$A = \frac{\sqrt{3}}{4} s^2 = \frac{\sqrt{3}}{4}(3.6\text{ cm})^2 \approx 5.270\text{ cm}^2$
So, the volume of the Toblerone packaging is:
$V = Ah = (5.270\text{ cm}^2)(21\text{ cm}) \approx 110.59\text{ cm}^3$
Therefore, the volume of the Toblerone packaging is approximately 110.59 cubic centimeters.