Volume of Rectangular Prisms EQ: How do you find the volume of rectangular prisms?

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Volume of Rectangular Prisms EQ: How do you find the volume of rectangular prisms?

Prism  A solid figure with two congruent and parallel faces.  Shape of these faces determine the name of the prism

Volume  Volume – the amount of space occupied by an object. (units 3 ). Example: The VOLUME of this cube is all the space contained by the sides of the cube, measured in cube units (units 3 ). l w h

Volume  Volume – Once we know the area of the base, we multiply by the height to determine the VOLUME of the prism. Volume = Bh Volume = Area of Base x Height Volume = (l x w) x h

Volume  Volume (rectangular prism) Formula: V = B x h V = l x w x h

Volume  Find the volume of this prism… Formula: V = B x h V = l x w x h 5 cm 4 cm 7 cm

Volume  Find the volume of this prism… Formula: V = B x h V = l x w x h V = 5cm x 4cm x 7cm 5 cm 4 cm 7 cm

Volume  Find the volume of this prism… Formula: V = B x h V = l x w x h V = 5cm x 4cm x 7cm V = 140cm 3 5 cm 4 cm 7 cm

Volume  Does it matter which side is the base? Formula: V = B x h V = l x w x h V = 7cm x 4cm x 5cm 5 cm 4 cm 7 cm

Volume  Volume of a Triangular Prism

Volume  The same principles apply to the triangular prism. To find the volume of the triangular prism, we must first find the area of the triangular base (shaded in yellow). b h

Volume  To find the area of the Base… Area (triangle) = b x h 2 This gives us the Area of the Base (B). b h

Volume  Now to find the volume… We must then multiply the area of the base (B) by the height (h) of the prism. This will give us the Volume of the Prism. B h

Volume  Volume of a Triangular Prism Volume (triangular prism) V = B x h B h

Volume  Together… Volume V = B x h

Volume  Together… Volume V = B x h V = (8 x 4) x 12 2

Volume  Together… Volume V = B x h V = (8 x 4) x 12 2 V = 16 x 12

Volume  Together… Volume V = B x h V = (8 x 4) x 12 2 V = 16 x 12 V = 192 cm 3

Volume  Your turn… Find the Volume