Thursday, February 16 th
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Transcript of Thursday, February 16 th
Thursday, February 16th • Please complete warm up and have your
Homework out (Cube Views)
WARM UP1. Find the Area Base: 4Height 11
2. Simplify 58 46
Joke of the Day Why did the cookie go to the doctor
It was feeling
“crummy”
Homework Answers
Goal for todayClass: Volume and Surface Area
for cubes
Bulldog Pride: View Extention with cubes
Surface Area
The surface area of a three-dimensional figure is the sum of the areas of its surfaces. Units squared!To help you see all the surfaces of a three-dimensional figure, you can use a net. A net is the pattern made when the surface of a three-dimensional figure is layed out flat showing each face of the figure.
Rectangular PrismsRectangular Prisms- have a total of 6 faces. We need to find the area for all 6 faces, and then add them together (remember- some faces will be congruent)
Find the surface area S of the prism.Use a net!
Draw a net to help you see each face of the prism.
Use the formula A = lw to find the area of each face.
Try Together!
Finding the Areas of each!
A: A = 5 2 = 10B: A = 12 5 = 60C: A = 12 2 = 24D: A = 12 5 = 60E: A = 12 2 = 24F: A = 5 2 = 10
S = 10 + 60 + 24 + 60 + 24 + 10 = 188Add the areas of each face.
The surface area is 188 in2.
#2
Let’s Label the Rectangles!
Why is finding Surface Area of a cube going to be
easier?
CubesCubes-have a total of 6 faces. We need to find the area for just one face and then multiply it by 6!
Try together!
7 in
1 face= 7 x 7=49
49 x 6 =
VOLUME
It takes 10, or 5 · 2, centimeter cubes to cover the bottom layer of this rectangular prism.
There are 3 layers of 10 cubes each to fill the prism. It takes 30, or 5 · 2 · 3, cubes.
Volume is expressed in cubic units, so the volume of the prism is 5 cm · 2 cm · 3 cm = 30 cm3.
Rectangular Prisms and Cubes Volume
v= l x w x h
V = lwh Write the formula.
V = 26 • 11 • 13 l = 26; w = 11; h = 13
Multiply.V = 3,718 in3
13 in.
26 in.11 in.
Find the volume of the rectangular prism.
V = lwh Write the formula.
V = 29 • 12 • 16 l = 29; w = 12; h = 16
Multiply.V = 5,568 in3
16 in.
29 in.12 in.
You Try!
HomeworkIf A is on the Bottom,
determine which letter is on the top!