1. Name ________________________________ Date __________________
Mrs. Labuski / Mrs. Rooney Period _____ Lesson 10-7 Surface Area
VOCABULARY DEFINITION EXAMPLE
Surface area
Net
To find the surface area of the triangular prism below, find the area of each face.
Face C Face D Face E
Face B
Face A
A = ½ bh A = ½ bh A = lw A = lw A = lw
A = _________ A = _______ A = _________ A = ______ A = _______
A = _________ A = _______ A = _________ A = ______ A = _______
Continued on next page

2. Now add all of the areas together:
Face A = 6 un2
Face B = 6 un2
Face C = 24 un2
Face D = 24 un2
Face E = 24 un2
Surface Area = __________
Now you try:
Side Area = bh Top Area = bh
Side Area = _________ Top Area = _________
Side Area = _________ Top Area = _________
x4 x2
___________ ___________
Sides __________
+ top __________
Surface area = ____________

5. Name ________________________________ Date __________________
Mrs. Labuski / Mrs. Rooney Period _____ Lesson 10-7 Surface Area
VOCABULARY DEFINITION EXAMPLE
The surface area of a solid
Surface area figure is the sum of the See below
areas of its surfaces
A net is the pattern made
when the surface of a
Net solid is laid out flat
showing each face of the
figure.
To find the surface area of the triangular prism below, find the area of each face.
Face C Face D Face E
Face B
Face A
A = ½ bh A = ½ bh A = lw A = lw A = lw
A=½x3x4 A=½x3x4 A=6x4 A=6x4 A=6x4
A = 6 un2 A = 6 un2 A = 24 un2 A= 24 un2 A = 24 un2
Continued on next page

6. Now add all of the areas together:
Face A = 6 un2
Face B = 6 un2
Face C = 24 un2
Face D = 24 un2
Face E = 24 un2
Surface Area = 86 un2
Now you try:
Side Area = bh Top Area = bh
Side Area = 10 x 8 Top Area = 8 x 8
Side Area = 80 Top Area = 64
x4 x2
320ft2 128ft2
Sides 320ft2
+ top 128ft2
Surface area = 448ft2

7. 4
A = lw A = ½ bh A=
6x6 A=½x6x5
A = 36 un2 A = 15 un2
x4
A = 60 un2
Sides = 60
+Base = 36
Surface area = 96 un2
6
A = lw
A = 10 x 10
A = 100 un2
x6
SA = 600 un2

8. 4
A = lw A = ½ bh
A=6x6 A = ½ x 6 x 16
A = 36 un2 A = 48 un2
x4
A = 192 un2
Sides = 192
+Base = 36
Surface area = 228 un2
front & back 2 sides 2 2
2.4cm 2.4cm top & 1.8cm
bottom
4.5cm
4.5cm 1.8cm
21.6
A = lw A = lw A = lw 8.64
A = 4.5 x 2.4 A = 1.8 x 2.4 A = 4.5 x 1.8 + 16.2
A = 10.8 cm2 A = 4.32 cm2 A = 8.1 cm2 46.44cm2
x2 x2 x2
A = 21.6 cm2 A = 8.64 cm2 A = 16.2 cm2