Math Problem Statement

what is the surface of the right rectangle prism? show your work

Solution

To find the surface area of a right rectangular prism, you need to calculate the area of all six faces of the prism and then sum them up. A right rectangular prism has three pairs of identical faces.

Let's break down the process:

  1. Identify the dimensions of the prism:

    • Let ll be the length.
    • Let ww be the width.
    • Let hh be the height.
  2. Formula for the surface area: The surface area AA of a right rectangular prism is given by the formula: A=2lw+2lh+2whA = 2lw + 2lh + 2wh This accounts for the areas of the three pairs of identical faces.

  3. Detailed Calculation:

    • The area of the two faces with dimensions l×wl \times w is 2lw2lw.
    • The area of the two faces with dimensions l×hl \times h is 2lh2lh.
    • The area of the two faces with dimensions w×hw \times h is 2wh2wh.

    Therefore, the total surface area AA is: A=2lw+2lh+2whA = 2lw + 2lh + 2wh

  4. Example Calculation: Suppose the dimensions of the prism are:

    • Length (ll) = 5 units
    • Width (ww) = 3 units
    • Height (hh) = 4 units

    Plug these values into the formula: A=2(5×3)+2(5×4)+2(3×4)A = 2(5 \times 3) + 2(5 \times 4) + 2(3 \times 4) A=2(15)+2(20)+2(12)A = 2(15) + 2(20) + 2(12) A=30+40+24=94 square unitsA = 30 + 40 + 24 = 94 \text{ square units}

    So, the surface area of this right rectangular prism is 94 square units.

Would you like any further details or have any questions?

Here are 5 related questions you might find interesting:

  1. How does the surface area change if one of the dimensions doubles?
  2. What is the surface area if the dimensions are all equal (i.e., a cube)?
  3. How do you find the volume of a right rectangular prism?
  4. What happens to the surface area if only the height is tripled?
  5. Can you derive the formula for the surface area of a prism from the general shape of the faces?

Tip: Always double-check the units of your measurements to ensure consistency when calculating surface areas.

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Math Problem Analysis

Mathematical Concepts

Geometry
Surface Area
Rectangular Prisms

Formulas

Surface Area of a Right Rectangular Prism: A = 2lw + 2lh + 2wh

Theorems

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Suitable Grade Level

Grades 5-7