anonymous
  • anonymous
A square pyramid has a lateral surface area of 20 square yards. If the slant height is 2 yards, what is the total surface area of the pyramid???
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Lateral surface area is the sum of the areas of the sides (triangular) but not the base. So the 4 triangles' areas add up to 20. The slant height is the height of the triangular side (not the height of the pyramid -- see the difference?) So you know the area of each triangle (calculate) and you know the height of each triangle. Get the length of the base, then the area of the base, then finish up.
anonymous
  • anonymous
BUt i dont get how to find the area and the base measurnments
bahrom7893
  • bahrom7893
oh i can figure this out i think, workin on it

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anonymous
  • anonymous
k its due tommorow and its getting late sooo...
bahrom7893
  • bahrom7893
k workin on it gimme about 10-20 mins
anonymous
  • anonymous
Use the formula for area of triangle: 1/2 * base * height. Area is known, height is known, so you can calculate base. Okay? Come on, stop giving up. You can do this.
bahrom7893
  • bahrom7893
5*5 = 25; the total area is 45
bahrom7893
  • bahrom7893
is that answer correct?
anonymous
  • anonymous
so the answer is 45??
bahrom7893
  • bahrom7893
Yeah well according to my calculations, u wanna see what i did?
bahrom7893
  • bahrom7893
leah go here: http://www.twiddla.com/493733 I will try explainin on a whiteboard
bahrom7893
  • bahrom7893
leah can u copy and paste the link above? i will draw it out. easier for both of us
anonymous
  • anonymous
Wait a sec i gotta go do somthing
bahrom7893
  • bahrom7893
http://bahrom7893.files.wordpress.com/2011/02/solution-to-pyramid1.png?w=648 I uploaded the solution there

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