Math 6: Measurement

Surface Area of a Rectangular Prism

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How do we find the Area of the rectangle?

8CM

4CM

AREA = LENGTH X WIDTH

AREA = 8CM X 4CM

AREA = 32CM2

DON’T FORGET TO ADD THE 2

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Area = L x W

Let’s try it with a few things around the classroom!!

Make sure you use the proper terms

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Surface Area of a rectangular prism: The area AROUND the rectangular prism

Think about it: How much wrapping paper do I need to wrap the box?

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How do you find the surface area? Find the area of the 6 faces and then add them up.

Step 1: Identify the measurement of the length, width, and height.

Step 2: Find the area of two sides (Length x Height) x 2 Step 3: Find the area of adjacent sides (Width x Height) x

2 sides Step 4: Find the area of ends (Length x Width) x2 ends Step 5: Add the three areas together to find the surface

area Step 6: Don’t forget to use the proper conventions

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Use the nets of the rectangular prism to calculate the surface area.

Label the Faces Calculate the area of each face Add up the totals

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Create a chart to find the surface area:

Then add up all the totals from the area

Face Length (cm)

Width (cm)

Area

A

B

C

D

E

F

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Use this formula: SA (Rectangular Prism) = 2 x (L x W + L x H + Hx

W)

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Let’s try to calculate the surface area of tissue boxes using one of these strategies.

Homework

pg. 222 - 223 #1, 2, 5, 7, 9

Work book: pg. 86 + 87