The width of a rectangle is 15 cm less than the length. the perimeter is 78 cm. find the rectangle's dimensions

Length (L): L

width (w): L - 15

Perimeter (P) = 2L + 2w

                78 = 2(L) + 2(L - 15)

                78 = 2L + 2L - 30

                78 = 4L - 30

               108 = 4L

                27 = L

width (w): L - 15   = 27 - 15   = 12

width = 12 cm, length = 27 cm

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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