Geometry 3d Figures Worksheets Geometry Surface Area and Volume With Cubes Easy
Example 1
(a)
Calculate the volume of the cuboid shown.
Volume = 4 × 18 × 5 = 360 m³
(b)
Calculate the surface area of the cuboid shown.
Surface area | = (2 × 4 × 18) + (2 × 4 × 5) + (2 × 5 × 18) |
= 144 + 40 + 180 | |
= 364 m² |
Example 2
Calculate the volume and total surface area of the cylinder shown.
Volume | = | π r²h = π × 4² × 6 = 96 π |
= | 301.5928947 cm³ | |
= | 302 cm³ (to 3 significant figures) |
Area of curved surface | = | 2π rh = 2 × π × 4 × 6 |
= | 48π | |
= | 150.7964474 cm² |
Area of each end | = | π r² = π × 4² |
= | 16π | |
= | 50.26548246 cm² |
Total surface area | = | 150.7964474 + (2 × 50.26548246) |
= | 251.3274123 cm² | |
= | 251 cm² (to 3 significant figures) |
Note: From the working we can see that the area of the curved surface is 48π, and that the area of each end is 16π. The total surface area is therefore
48π + (2 × 16π) | = 80π = 251.3274123 cm² |
= 251 cm² (to 3 significant figures) |
Example 3
Calculate the volume of this prism.
Area of end of prism | = | × 8 × 6 |
= | 24 cm² |
Volume of prism | = | 24 × 10 |
= | 240 cm³ |
Exercises
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Source: https://www.cimt.org.uk/projects/mepres/book9/bk9i9/bk9_9i4.html