a cone shaped cup has a diameter of 8cm and a slant height of 9cm. what is its lateral surface area?

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a cone shaped cup has a diameter of 8cm and a slant height of 9cm. what is its lateral surface area?

2006-10-02 18:27:31 · 4 answers · asked by wood6605 1 in Science & Mathematics ➔ Mathematics

4 answers

A conical surface S can be described parametrically as

S(t,u) = v + uq(t),
where v is the apex and q is the directrix.

2006-10-02 18:30:29 · answer #1 · answered by junaidi71 6 · 0⤊ 0⤋

P = pi*d 8*pi = perimeter of a full circle of diameter 9
2pi*9 = 18*pi = perimeter of a full circle of radius 9
8/18 = ratio of area of the side of the cone to area of a full circle of radius 9
A = 8*pi*81/18

2006-10-03 01:53:08 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋

18.

2006-10-03 01:35:13 · answer #3 · answered by akg_dnn 2 · 0⤊ 0⤋

(Pi*(d/r))*r^2/2
=pi*8*9/2
=113.097 cm^3

2006-10-03 01:38:35 · answer #4 · answered by sanjeewa 4 · 0⤊ 0⤋