Warm Up

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# Warm Up - PowerPoint PPT Presentation

Find the perimeter and area of each polygon. Show work and include units! 1. 2. 3. . 20 m. 12 m. 6 in. 13 m. 12 m. 5 in. 25 m. 7 in. 14 cm. Warm Up. 8 cm. 11 cm. Lesson 5-1: Surface Area of Cubes and Rectangular Prisms. I can…. Vocabulary. Surface Area Net Cube

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1. 2.

3.

20 m

12 m

6 in

13 m

12 m

5 in

25 m

7 in

14 cm

Warm Up

8 cm

11 cm

### Lesson 5-1:Surface Area of Cubes and Rectangular Prisms

I can…

Vocabulary

• Surface Area
• Net
• Cube
• Right Prism
• find the surface area of a cube.
• find the surface area of a rectangular prism.

The total area of the surface of a three dimensional object

*We will use nets to help us

determine the surface area

Surface Area

A two-dimensional figure that can be folded on its segments or curved on its boundaries to form a three-dimensional figure.

Net

First, let’s draw a net of a cube.

1. If one side length is 3 cm long, what is the area of one square?

9 squared cm

2. How many squares do we have?

6 squares

Surface Area of a Cube

3. What is our surface area for this cube?

54 squared cm

First, let’s draw a net of a rectangular prism.

SA= 2[(length x width) +(length x height)+(width x height)]

SA= 2[(3 x 2)+(3 x 6)+(2 x 6)]

Surface Area of a Rectangular Prism

SA= 2[(6)+(18)+(12)]

SA= 2(36)

SA= 72 squared cm

What is the surface area of the rectangular prism?

SA= 2[(5 x 4)+(5 x 10)+(4 x 10)]

SA= 2[(20)+(50)+(40)]

SA= 2(110)

SA= 220 squared cm

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