A solid frustum is of height 8 cm. If the radii of its lower and upper ends are 3 cm and 9 cm respectively, then its slant height is

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KollegeApply · Accepted Answer

r_1 = 9 "cm" r_2 =3 "cm" h = 8"cm" Slant height of frustum , l =sqrt(h^2 + (r_1 - r_2)^2) = sqrt(8^2 + (9 - 3)^2) = sqrt(64 + 36) = sqrt 100 = 10 "cm"

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