1. Surface Area of Triangular Prisms
Geometry
Surface Area of Triangular Prisms

2. Surface Area
Triangular prism – a prism with two parallel, equal triangles on opposite sides.
To find the surface area of a triangular prism we can add up the areas of the separate faces. h w l

3. Surface Area
In a triangular prism there are two pairs of opposite and equal triangles.
We can find the surface area of this prism by adding the areas of the pink side (A), the orange sides (B), the green bottom (C) and the two ends (D).
8 cm A
2 cm B
5 cm C
7 cm

4. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A B C D
Total
8 cm A
2 cm B
5 cm C
7 cm

5. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A
40 cm2 1 B C D
Total
8 cm A
2 cm B
5 cm C
7 cm

6. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A
40 cm2 1 B
10 cm2 C D
Total
8 cm A
2 cm B
5 cm C
7 cm

7. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A
40 cm2 1 B
10 cm2 C
35 cm2 D
Total
8 cm A
2 cm B
5 cm C
7 cm

8. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A
40 cm2 1 B
10 cm2 C
35 cm2 D
7 cm2 2
14 cm2
Total
8 cm A
2 cm B
5 cm D C
7 cm

9. Surface Area We should use a table to tabulate the various areas.
Example:
Side
Area
Number of Sides
Total Area A
40 cm2 1 B
10 cm2 C
35 cm2 D
7 cm2 2
14 cm2
Total 5
99 cm2
8 cm A
2 cm B
5 cm D C
7 cm

10. Surface Area Now you try...find the surface area! Example: B C Side
No of Sides C

11. Surface Area Now you try...find the surface area! Example: B C Side
No of Sides
2.1m C
2.0m
11.0m
2.0m