Post a New Question

math

posted by on .

1. find the lateral area of a right prism whose altitude measures 20 cm and whose base is a square with a width 7 cm long.
2. the volume of a rectangular solid is 5376 cubic meters, and the base is 24 meters by 16 meters. find the height of the solid.
3. a rectangle has a perimeter of 22cm and an area of 30 cubic meter. what are its dimensions?

  • math - ,

    1. The lateral area is the sum of the
    areas of the vertical sides.
    Al = 2(W*h) + 2(L*h).
    Al = 2( 7*20) + 2(7*20) = 560 cm^2.

    2. V = L*W*h.
    22*16*h = 5376.
    Solve for h.

    3. 2W + 2L = 22,
    Divide both sides by 2:
    L + W = 11,
    L = 11-W.

    L*W = 30,
    Substitute 11-W for L:
    (11-W)W = 30,
    -W^2+11W-30 = 0,
    W^2-11W+30 = 0,
    (W-5)(w-6) = 0,
    W = 5 or 6.

    L+5 = 11,
    L = 6.

    Dimensions = 6 x 5.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question