1. Surface Area of Triangular Prisms

2. Definition:
The sum of the areas of all of the faces of a three-dimensional figure.
Ex. How much construction paper will I need to fit on the outside of the shape?

3. A triangular prism has 5 faces.
2 Triangular bases
3 rectangular sides
BACK
LEFT
RIGHT
FRONT
BOTTOM

4. Unfolded net of a triangular prism

5. A triangular prism has 5 faces.
FRONT
RIGHT
BOTTOM
LEFT
BACK

6. In order to find the surface area, find the area of each face
In order to find the surface area, find the area of each face. Then sum all of the areas.
FRONT
RIGHT
BOTTOM
LEFT
BACK

7. Practice Time!

8. 1) Find the surface area of the triangular prism.

9. 1) Find the surface area of the triangular prism.

10. 1) Find the surface area of the triangular prism.
40 sq ft
8 ft
100 sq ft
5 ft
10 ft
200 sq ft
20 ft
20 ft
100 sq ft
40 sq ft
5 ft
8 ft
10 ft
20 ft
10 ft

11. 40 + 40 + 100 + 100 + 200 = 480 sq ft 40 sq ft 100 sq ft 200 sq ft

12. 2) Find the surface area of the triangular prism.

13. 2) Find the surface area of the triangular prism.

14. 2) Find the surface area of the triangular prism.
30 sq ft
5 ft
128 sq ft
8 ft
12 ft
16 ft
192 sq ft
16 ft
128 sq ft
8 ft
5 ft
30 sq ft
12 ft
16 ft
12 ft

15. 30 + 30 + 128 + 128 + 192 = 508 sq ft 30 sq ft 128 sq ft 192 sq ft

16. 3) Find the surface area of the triangular prism.

17. 3) Find the surface area of the triangular prism.

18. 3) Find the surface area of the triangular prism.
60 sq ft
8 ft
220 sq ft
10 ft
15 ft
22 ft
330 sq ft
22 ft
220 sq ft
10 ft
60 sq ft
8 ft
15 ft
22 ft
15 ft

19. 60 + 60 + 220 + 220 + 330 = 890 sq ft 60 sq ft 220 sq ft 330 sq ft

20. 4) Find the surface area of the triangular prism.

21. 4) Find the surface area of the triangular prism.

22. 4) Find the surface area of the triangular prism.
2.5 sq ft
2 ft
32 sq ft
4 ft
2.5 ft
8 ft
20 sq ft
8 ft
32 sq ft
4 ft
2.5 sq ft
2 ft
2.5 ft
8 ft
2.5 ft

23. 2.5 + 2.5 + 32 + 32 + 20 = 89 sq ft 2.5 sq ft 32 sq ft 20 sq ft