Three of these measurements are the sides of the triangle, the fourth being the length of the prism. Each side of the triangle together with the length of the prism defines a rectangle, so the surface area is the sum of the areas of three rectangles. However, we don't know which measurement is the length, so there are four answers:
- 24m is the length, so the surface area is 24(10+14+17.2)=988.8 sq m.
- 10m is the length, sa=10(24+14+17.2)=552 sq m.
- length=14; sa=14(24+10+17.2)=716.8 sq m.
- length=17.2; sa=17.2(10+14+24)=825.6 sq m.