A library has an aquarium in the shape of a rectangular
prism. The base is 6 ft by 2.5 ft. The height is 4 ft. How
many square feet of glass was used to build the aquarium?
prism. The base is 6 ft by 2.5 ft. The height is 4 ft. How
many square feet of glass was used to build the aquarium?
Students in 2°, you are almost halfway through Chapter Eight. Up to this point, we have discussed customary unit measures, significant digits, and circumference of a circle. Once class resumes, it is expected that you can recall this information for a Quick Check. If you would like, you are encouraged to post an answer to the question below.
The largest tree in the United States is growing in
Sequoia National Park in California. The tree is a giant sequoia whose
trunk is roughly circular and has a circumference of 998 inches. What
is the tree’s diameter?
Sequoia National Park in California. The tree is a giant sequoia whose
trunk is roughly circular and has a circumference of 998 inches. What
is the tree’s diameter?
For the problem above I got an answer of 98 square feet. Here is how I got my answer: First I started out with the formula to find the surface area of a prism which is: 2(w*h) + 2(l*h) + 2(l*w)= Surface Area. So from there I just took it in little steps, so then I did 2 x 2.5 x 4 = 20 then I added 20 to 2 x 6 x 4 = 48. When you add 20 and 48 you get 68 , but wait we are not done yet you still have to do 2 x 6 x 2.5 = 30 and 68 plus 30 give you 98 and that is how I got my answer of 98 square feet.
ReplyDeleteSteroig
P.S. I thought this formula was kinda long and a little tedious so tried to look for another formula and this is what I got: (w*h) + (l*h) + (l*w) x 2 and I know it is pretty similar but I have not proven this theory 100 % true but it did work for the question above and I got the same end result. But I just think it is just a hair easier to multiply the whole thing by 2 instead of multiplying by 2 each time. So I will try this theory on similar problems to try to prove it wrong, and if everything proves that it works then I guess it works.
Roig, I too find the formula long and clunky. You are right about your theory. A=2(wl+hl+hw) will also work. It is not much different, but simply enough that it will alleviate some confusion.
ReplyDeleteI got 98 square feet by using the formula 2(w*h)+2(l*h)+2(l*w). Knowing that formula I just put in the numbers given. So I did 2(2.5*4)+2(6*4)+2(6*2.5). When I multiplied and added them all together and got 98 square feet.
ReplyDeleteCamille Olijar
My answer was 98 sq ft and I got that by using the formula 2(w*l)+2(w*h)+2(l*h) and put the numbers into there place.
ReplyDeleteMy answer is 98 by using the formula 2(w*l)+2(w*h)+2(l*h)
ReplyDelete