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3 July, 02:38

Consider two congruent triangular prisms. Each rectangular face of prism A has a width of x + 2 and each rectangular face of prism B has a length of 2x + 4. If each rectangular face of prism A has an area of 10x + 20, what is the volume of prism B? (round to nearest whole number in cm3)

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  1. 3 July, 05:02
    0
    The volume of prism B is 108 cm³

    Step-by-step explanation:

    * Lets study the information to solve the problem

    - Any triangular prism has five faces, two of them are triangles and the

    other three are rectangles

    - Its two bases are triangles

    - Its side faces are rectangles

    - The volume of it is its base area * its height

    - The two triangular prisms are congruent, then all corresponding

    dimensions are equal and their surface areas and volumes are equal

    * Now lets solve the problem

    ∵ The two triangular prisms are congruent

    ∴ All corresponding faces are congruent

    ∵ The width of each rectangular faces in prism A = x + 2

    ∴ The width of each rectangular faces in prism B = x + 2

    - The side of the triangular base is the width of the rectangular face

    ∴ All sides of the triangular base in the prism B = x + 2

    ∵ The area of the all rectangular face in prism A = 10x + 20

    ∴ The area of the all rectangular face in prism B = 10x + 20

    ∵ The length of each rectangular face in prism B is 2x + 2

    - The length of the rectangular face of the triangular prism is its height

    ∴ The height of the prism b = 2x + 4

    * Now lets find the value of x

    ∵ The rectangular face of prism B has width x + 2, length 2x + 4

    and area 10x + 20

    ∵ The area of the rectangle = length * width

    ∴ (2x + 4) * (x + 2) = 10x + 20 ⇒ simplify by using foil method

    ∵ 2x (x) + 2x (2) + 4 (x) + 4 (2) = 10x + 20

    ∴ 2x² + 4x + 4x + 8 = 10x + 20 ⇒ add the like term

    ∴ 2x² + 8x + 8 = 10x + 20 ⇒ subtract 10 x from both sides

    ∴ 2x² - 2x + 8 = 20 ⇒ subtract 20 from both sides

    ∴ 2x² - 2x - 12 = 0 ⇒ divide all terms by 2 to simplify

    ∴ x² - x - 6 = 0 ⇒ factorize it into two factors

    ∵ x² = x * x

    ∵ - 6 = - 3 * 2

    ∵ - 3x + 2x = - x

    ∴ (x - 3) (x + 2) = 0

    - Equate each bracket by 0

    ∴ x - 3 = 0 ⇒ add 3 to both sides

    ∴ x = 3

    OR

    ∴ x + 2 = 0 ⇒ subtract 2 from both sides

    ∴ x = - 2 ⇒ we will refuse this value of x because there is no

    negative dimensions

    ∴ The value of x is 3 only

    - Lets find the dimensions of the prism B

    ∵ Its width = x + 2

    ∴ Its width = 3 + 2 = 5 cm

    ∴ The sides of the triangular base are 5 cm

    ∵ The triangular base is equilateral triangle

    ∵ The area of any equilateral triangle = √3/4 (side) ²

    ∴ The area of the base = (√3/4) (5) ² = 25√3/4 cm²

    ∵ The height of the prism B = 2x + 4

    ∵ x = 3

    ∴ The height = 2 (3) + 4 = 6 + 4 = 10 cm

    ∵ The volume of any prism = its base area * its height

    ∴ The volume of prism B = 25√3/4 * 10 ≅ 108 cm³

    * The volume of prism B is 108 cm³
  2. 3 July, 05:15
    0
    108 cm3

    Step-by-step explanation:

    l x w = A

    (x + 2) (2x + 4) = 10x + 20

    x = 3

    Then, use the width expression to find the side lengths of the equilateral triangle.

    x + 2

    3 + 2

    5

    Then, find the area of the equilateral triangle.

    A =

    3

    4

    S2

    A =

    3

    4

    52

    A = 10.82

    Then, use the length expression to find the length and multiply times the area of the triangle.

    2x + 4

    2 (3) + 4

    6 + 4

    10

    Thus, V = 10 x 10.82 = 108.2
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