Surface Area Nets & Rectangular Prisms. Rectangular Prisms Made of 6 sides Top & Bottom Front & Back Left & Right.

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Presentation transcript:

Surface Area Nets & Rectangular Prisms

Rectangular Prisms Made of 6 sides Top & Bottom Front & Back Left & Right

Nothing but Net! A net is the pattern to make a box. Notice this net will fold up to make the box.

This one too! The net will fold up to create the box.

Surface Area of a Net Find the area of each rectangle Add them up!

What about boxes? Find the area of each side (rectangle) add them together

Use the Formula 2(l W) + 2(W h) + 2(l h) or SMILE!! Length x Width x Height To find the surface area

Smiley Face Method Multiply l x w Multiply w x h Multiply l x h Length x Width x Height This gives you the area of the Top the Side the Front ADD ‘ EM UP!!!

You’re Not Done Yet! Since a box has six sides and you’ve only found three sides, you have to double your answer.

It makes no difference The surface area of a net is the SAME as the surface area of the box.

Check it out! 3 x 2 = 6 2 x 6 = 12 3 x 6 = 18 Adds to 36 cm 2 Double it! 72 cm Add ‘em up! 72 cm 2 They are the SAME!!!