Here are the steps to solve these problems: 6) Rectangular prism with dimensions 10 ft x 5 ft x 3 ft - Front/Back: A = l x w = 10 x 3 = 30 ft^2 - Left/Right sides: A = l x h = 5 x 3 = 15 ft^2 - Top/Bottom: A = w x h = 10 x 5 = 50 ft^2 - Total SA = 2(Front/Back) + 2(Left/Right) + Top/Bottom = 2(30) + 2(15) + 50 = 120 + 30 + 50 = 200 ft^2 7) Triangular prism with dimensions 6 in x 4 in x

1.  In 1861 the Union’s population was 23,000,000
people and the Confederacy’s was 9,000,000.
 In the U.S. Civil War, the cost to the Union was
about $3.2 billion, and the cost to the
Confederacy was about $2 billion
 How much money did the Union spend for each
person in the Union?
 How much money did the Confederacy spend for
each person in the Confederacy ?

2.  In 1861 the Union’s population was 23,000,000
people and the Confederacy’s was 9,000,000.
 In the U.S. Civil War, the cost to the Union was
about $3.2 billion, and the cost to the
Confederacy was about $2 billion
 How much money did the Union spend for each
person in the Union?
 $139.13
 How much money did the Confederacy spend for
each person in the Confederacy ?
 $222.22

3. Lesson 10.4, For use with pages 542-547
Identify the solid.
1.
2. Count the number of faces, edges, and vertices
for the figure.

4. Lesson 10.4, For use with pages 542-547
Identify the solid.
1.
ANSWER triangular prism
2. Count the number of faces, edges, and vertices
for the figure.
ANSWER 5; 9; 6

5. Surface Area of Prisms &
Cylinders
Section 10.4
P. 542

6. Vocabulary
 Surface Area: (SA) of a polyhedron is the sum of
the areas of all the faces.
 Prism: a polyhedron that has two congruent faces
that are parallel polygons. Each parallel,
congruent face is called a base.
 Prisms are named for the shape of their bases.

7.  If you were to find the surface area of
rectangular prism, what measurements
would you need to know?

8.  You would need the length, width, and the
height of the prism.
Think front and back
5 in
Top and bottom
L/R Sides 2 in
9 in

9.  Find the SA of the rectangular prism
Front: A = b x h
30 x 12 = 360 12 ft
Side: A = b x h
30 x 10 = 300
Top: A = b x h 30 ft
12 x 10 = 120
360+360+300+ 10 ft
300+120+120= 1560 ft sq.

10.  Find the SA of this triangular
prism
Triangle A= b x h ÷ 2
(5 x 7) ÷ 2= 17.5
Rectangle A = b x h
15 x 5 = 75
5 5
17.5 + 17.5 + 75 15 ft
7
+75 + 75= 7
260 ft sq.
5

11. Base: A = b x h ÷ 2
6 ft 15 ft
(9x12) ÷ 2= 54
Bottom: A = b x h
9 ft 12 x 6 = 72
Top: A=bxh
12 ft
 Find SA
15 x 6 = 90
Think : Left back: A = b x h
2 Bases (f/b)
Bottom 6 x 9 = 54
Slanted Top
54 + 54 + 90 + 54 +72 = 324 ft s q.
Left Back

12. Homework
 Page 546 #6-8, 13.