If r = 3 in. and h = 4 in., find the slant height and the lateral area of the right cone
2007-07-11 10:57:43 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Slant height =5 because of Pythagorean theorem. The area is 9pi + 6. because of the area of the cone plus the area of the circle.
2007-07-11 11:01:19 · answer #1 · answered by Anonymous · 1⤊ 1⤋
the slant is equal to 5 in ( the famous triple 3 - 4 - 5 )
the angle sector ( the one you make in paper to make the cone )
is given by :
360° * 6pi in / (10pi in) = 216 °
( "10pi in" is the perimeter of a full 5 in radius circle, next we use the proportionality between angle sector and perimeter )
the area of a full 5 in radius circle is 25pi in²
thanks to proportionality, we have the area of the sector :
25pi in² * 216° / (360°) = 15pi in²
2007-07-11 11:16:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
slant height = l sqrt(3^2+4^2) = 5
lateral area =pi*rl = 15pi in^2
2007-07-11 11:20:10 · answer #3 · answered by ironduke8159 7 · 0⤊ 1⤋
slant height : 5 in
lateral area: 47.124 sq in
2007-07-11 11:08:11 · answer #4 · answered by mimi 3 · 0⤊ 0⤋
Stupid?
nonononono
Sit down, open your textbook ( or notes ) and answer the question.
If you don't understand it or have trouble remebering the formula, look back !
2007-07-11 11:03:03 · answer #5 · answered by j22kat 2 · 0⤊ 3⤋
You aren't stupid. I can't answer that question either. Good luck with finding the answer:)
2007-07-11 11:05:53 · answer #6 · answered by ralahinn1 7 · 0⤊ 2⤋
blue!
2007-07-11 11:00:20 · answer #7 · answered by Creepy Uncle Bob 3 · 1⤊ 4⤋
u dont even say please and it is summer i am not thinkin anymore
2007-07-11 11:00:08 · answer #8 · answered by Dorothy 2 · 0⤊ 5⤋