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!