1 Quiz-Warm Up! Remember 5 minutes only! Fill in the graphic organizer using what you learned yesterday.
2 Rectangular Prism Finding Surface Area Step 1: Flatten the 3-D figure A rectangular prism will flatten to 6 rectangles.Depending on the dimensions of the 3-D figure, you will have different size rectangles.
3 Rectangular Prism Finding Surface Area Step 2: Transfer the dimensions to the 3-D figureDimensions: Length – 12 (the longest side) Height – 8 (top to bottom) Width – 4 (front to back)Rectangular PrismHeight8Width4Length12
4 Finding Surface Area Rectangular Prism Step 3: Transfer the dimensions from the 3-D figure to the flattened figureDimensions: Length – 12 (the longest side) Height – 8 (top to bottom) Width – 4 (front to back)124Height8Width84Length12124884124
5 Finding Surface Area Rectangular Prism Step 4: Find the AREA for each rectangle. (Length X Width)Height8Width412Length12 x 4448 sq units1212 x 8896 sq units1212 x 4448 sq units812 x 883296 sq units328 x 48 x 44124
6 Add together the areas for each rectangle Finding Surface AreaRectangular PrismStep 4: Find the TOTAL SURFACE AREA for the 3-D FigureAdd together the areas for each rectangle84124848 sq units48969696 sq units3232Total surface area48 sq units= sq. units3296 sq units32
7 Cube or SquareA cube or square will flatten to 6 equal squares.
8 Cube or SquareUse the four-step process to find the surface area of the cube.Step 1: Flatten (already done)Step 2: Transfer numbersStep 3: Find area of each faceStep 4: Find total area5 m5 m
16 Cylinder Step 1: Flatten the 3-D shape A Cylinder will flatten to a rectangle and two equal circles.
17 Cylinder r = d 2 Step 2: Transfer the dimensions to the 3-D shape Diameter8Step 3: Transfer dimensions to the flattened shapeDiameter = 8radiusLength =4Height2Π4 = 8Π8Π = 2515Height1515Height - 1525Diameter - 8Formulas to use: A =r = 4r = d2
18 Cylinder Step 4: Find the area for each shape 8 8 3.14 x 4 x 4 = 50 25Step 5: Add the areas for the shapes1525 x 1515A = 3755050375425= Total surface area4A = 50