Finding the Volume of Solid Figures

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Presentation transcript:

Finding the Volume of Solid Figures MCC6.G.2 – Find the volume of a right rectangular prism with fractional edge lengths by packing it with unit cubes of the appropriate unit fraction edge lengths, and show tha the volume is the same as would be found by multiplying the edge lengths of the prism. Apply the formulas V = lwh and V = bh to find volumes of right rectangular prisms with fractional edge lengths in the context of solving real-world and mathematical problems.

What Is Volume ? The volume of a solid is the amount of space inside it. Consider this rectangular prism. If we were to fill the prism with water, the volume would be the amount of water it could hold.

Measuring Volume Volume is measured in cubic centimeters (also called centimeters cubed). Here is a cubic centimeter It is a cube which measures 1cm in all directions. 1cm

Volume of a Rectangular Prism Look at the rectangular prism below: 10cm 3cm 4cm We must first calculate the area of the base (“big B”): The base is a rectangle measuring 10cm by 3cm: 3cm 10cm

3cm 10cm Area of a rectangle = length x width Area = 10 x 3 Area = 30cm2 We now know we can place 30 centimeter squares on the base of the prism. 10cm 3cm 4cm

10cm 3cm 4cm Now we need to find how many layers of 1cm cubes we can place in the prism: We can fit 4 layers. Volume = 30 x 4 Volume = 120cm3 That means that we can place 120 centimeter cubes inside the prism.

You can also use V=l x w x h 10cm 3cm 4cm We have found that the volume of the prism is given by: Volume = 10 x 3 x 4 = 120cm3 This gives us our formula to find the volume of a prism: Volume = Area of the base x Height V=Bh You can also use V=l x w x h

Let’s Practice V = B h lw V = 14(5)(7) V = 490 cm3 Calculate the volume of the prism below: (1) 14cm 5 cm 7cm V = B h lw V = 14(5)(7) V = 490 cm3

V = B h lw V = B h lw V = 12(12)(12) V = 9(7)(3.2) V = 1728 cm3 (2) (3) 12 cm 9 m 7m 3.2m 12 cm 12 cm V = B h lw V = B h lw V = 12(12)(12) V = 9(7)(3.2) V = 1728 cm3 V = 201.6 m3