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Parallelepiped: Definition and Examples | EDU.COM

Parallelepiped: Definition and Examples | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">ParallelepipedParallelepiped: Definition and ExamplesTable of ContentsParallelepiped: Definition, Properties, and Examples Definition of Parallelepiped

A parallelepiped is a three-dimensional geometric solid with six faces, where each face is a parallelogram. It can also be described as a prism with a parallelogram base. As a polyhedron, it has 666 faces, 121212 edges, and 888 vertices with three pairs of parallel faces joined together. Each face appears to be the mirror image of its opposite face when viewed from outside.

Special cases of parallelepipeds include the cube (with six square faces), the cuboid or rectangular parallelepiped (with six rectangular faces), and the rhombohedron (with six rhombus faces). A parallelepiped's properties include being a solid figure with three dimensions, having three pairs of parallel faces, and featuring face diagonals on each face. Each pair of opposite edges in the same direction has equal length, but edges in different directions may have different lengths.

Examples of Parallelepiped Calculations Example 1: Finding Lateral Surface Area Problem:

Find the parallelepiped's lateral surface area if its base face has opposite sides measuring 555 inches by 777 inches and a height of 666 inches.

Step-by-step solution:

Step 1, Identify the given measurements. We have a=5a = 5a=5 inches and b=7b = 7b=7 inches for the base, and height =6= 6=6 inches.

Step 2, Recall the lateral surface area formula. For a parallelepiped, the formula is:

LSA=2(a+b)×hLSA = 2(a + b) \times hLSA=2(a+b)×h This represents the sum of the areas of the four lateral faces (excluding top and bottom).

Step 3, Substitute the values into the formula.

LSA=2(5+7)×6LSA = 2(5 + 7) \times 6LSA=2(5+7)×6

Step 4, Simplify and calculate.

LSA=2(12)×6=144LSA = 2(12) \times 6 = 144LSA=2(12)×6=144 inches2^{2}2 Example 2: Calculating Painting Cost Problem:

The sides of a parallelepiped's base are given by 777 feet and 111111 feet, respectively. The parallelepiped has a height of 888 feet. Find out how much it would cost to paint its lateral walls for $20\$20$20 per square foot.

Step-by-step solution:

Step 1, Identify the given measurements. We have a=7a = 7a=7 feet, b=11b = 11b=11 feet, and height =8= 8=8 feet.

Step 2, To find the cost, we first need to calculate the lateral surface area using the formula:

LSA=2(a+b)×hLSA = 2(a + b) \times hLSA=2(a+b)×h

Step 3, Substitute the values into the formula.

LSA=2(7+11)×8=2(18)×8=288LSA = 2(7 + 11) \times 8 = 2(18) \times 8 = 288LSA=2(7+11)×8=2(18)×8=288 sq. feet

Step 4, Calculate the total cost by multiplying the lateral surface area by the cost per square foot.

Cost=288×$20=$5,760\text{Cost} = 288 \times \$20 = \$5,760Cost=288×$20=$5,760 Example 3: Finding Total Surface Area Problem:

A rectangular box has dimensions 555 in ×\times× 444 in ×\times× 333 in. Find the total surface area.

Step-by-step solution:

Step 1, Identify the dimensions of the rectangular box. We have length (aaa) = 555 in, width (bbb) = 444 in, and height (hhh) = 3 in.

Step 2, Recall the total surface area formula for a rectangular parallelepiped:

TSA=2(a×b+b×h+h×a)TSA = 2(a \times b + b \times h + h \times a)TSA=2(a×b+b×h+h×a)

Step 3, Substitute the values into the formula.

TSA=2(5×4+4×3+3×5)TSA = 2(5 \times 4 + 4 \times 3 + 3 \times 5)TSA=2(5×4+4×3+3×5)

Step 4, Calculate each part inside the parentheses.

TSA=2(20+12+15)TSA = 2(20 + 12 + 15)TSA=2(20+12+15)

Step 5, Complete the calculation.

TSA=2(47)=94TSA = 2(47) = 94TSA=2(47)=94 in2^{2}2 Comments(2)LLeatherworkerKimNovember 4, 2025I've used this parallelepiped def for my kid's studies. The examples are super helpful, making a tricky topic easy to grasp!

MCMs. CarterSeptember 17, 2025I’ve used the Parallelepiped examples from this page to help my kids visualize geometry concepts better. The painting cost calculation was a fun, practical way to keep them engaged!

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