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Geometry Volume of Rectangular and Triangular Prisms
Volume Volume – the amount of space occupied by an object. 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 – To calculate the volume of a prism, we first need to calculate the area of the BASE of the prism. Example: The AREA of the base of this rectangular prism is l x w. l w h
Volume Volume – Once we know the area of the base, this is then multiplied by the height to determine the VOLUME of the prism. We find that: Volume = Area of Base x Height Volume = (l x w) x h l w h
Volume Volume (rectangular prism) Formula: V = B x h V = l x w x h l w 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
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