Tutors Answer Your Questions about Surface-area (FREE)
Question 729332: Eskimos build igloos as temporary shelters from blocks of ice. The igloo is a hemisphere. If the outside diameter is 15 feet, and the ice is 1.5 feet thick, find the surface area of the outside of the igloo and the surface area of the inside of the igloo.
Click here to see answer by lynnlo(4176)  |
Question 729534: Please let know if I solved this problem correctly. If I did not solve the problem correctly, will you please provide me with the correct formula to solve the problem. The inside of a cylindrical steel drum, including the top and bottom, is to be painted with rust-inhibiting paint. The inside diameter of the drum is 1.8 feet, and the height is 2.6 feet. What is the total surface area to be painted? Use 3.14 for pi.
S= 2*(pi)*rh+2*(pi)*r^2
S= {2*(pi)*0.9*(2.6)}+(2*(pi)*0.9^2)
S= (2*(pi)*2.34)+(2*(pi)*0.81)
S= 4.68*(pi)+1.62*(pi)
S= 14.6952+5.0868
S= 19.782
S= 19.8 ft^2
Click here to see answer by jim_thompson5910(35256) |
Question 730194: Hello, I was wondering if I could have some help solving this question, thanks:
The link to the diagram of the question is here: http://puu.sh/2nCh3
The shape in this question is a parallelepiped.
1. Find the area of the parallelogram OAFE.
for this i found the cross product to be:
{4i + 3j - 15k}
and so the area to be : {15.8u^2}
however im not sure whether the vectors should of been {OA=3i} and {0E=0i+5J+1k} instead of {AO=-3i}.
I also tried to see whether the vectors are perpendicular but found that the cross product of AO is -12 while for OE is 0. Shouldn't they both be zero to be perpindicular and if so have i done this wrong or are they not perpendicular.
2.Find the area of triangle OAF.
for this i know to use the rule {{1/2}*|a*b|} which would give the area OAF is {7.9u^2} but im not sure.
3. Find a unit vector that is perpendicular to the face OABC.
4. Find the volume of the parallelepiped.
i know the rule is {|a|*|b|*|c|*sinx*cosx} and then you find the cross product and so the answer from question 1 is used {4i + 3j - 15k} .
Is the dot product used for that resultant vector with the OC??
Thank you for having a look at the question and any help would be greatly appreciated!
Click here to see answer by lynnlo(4176) |
Question 730505: Lena is cutting a piece of plywood serve as the base for a model. the base is a square whose perimeter is 48 cm. Lena knows that perimeter for the formula is 4s. how long should she make the length of each side of the square base?
Click here to see answer by rfer(16322) |
Question 732002: A hexagon with an area of 30cm^2 is made up of six tiles taht are equilaterial triangles. One of the tiles is removed and the remaining five are bent so that the two free edges come together, forming the object into a pentagonal pyramid (with no bottom). Determine the height of the pyramid to two decimal places.
Click here to see answer by lynnlo(4176) |
Question 731994: The 2 square squares in the figure below have the same dimensions. The vertex of one square is at the center of the other square. What is the area of the shaded region, in square inches?
http://tinypic.com/r/1y678j/6 (the diagram)
Click here to see answer by lynnlo(4176) |
Question 732598: Write 2 real-life problems that involve finding the area of a triangle, circle, trapezoid or parallelogram. Then explain how to solve your problem, and solve it. You need to use 2 different shapes.
Click here to see answer by KMST(5328)  |
Question 732603: What is the radius of a cone that has Surface Area of 219.91 in^2 and a slant height of 9 in?
I set up the problem: 219.91=(PI)r^2 + 9(PI)r
I can't figure out the steps to solve this problem. I think I am missing information?
Click here to see answer by KMST(5328) |
Question 733038: C is the right angle in triangle ABC.
D is the midpoint of side AC. E is the midpoint of side BC.
The length of line segment BD is 26. The length of line segment AE is 4 times the square root of 34.
How long is side AB?
Click here to see answer by lynnlo(4176) |
Question 733250: A metal cube of side l (this is the letter L lower case not no.1) is heated and each side increases by 1%. To the nearest percent find the increase in surface area & volume.
Please show workings down page if you can. It makes more sense to me. Thank you.
Click here to see answer by sachi(548)  |
Question 733934: The length and width of a rectangular field are in the ratio 4:3. If the area is 432 square units, find its perimeter.
What I have done so far was multiply 4 by 3 and divided the product by 432.
Click here to see answer by rfer(16322) |
Question 733991: Hello! Trying to calculate the total surface area of 2 semi-circles. Semicircle #1 is the left half of a semicircle with a radius of 10 feet. Semicircle #2 is the right half of a semicircle with a radius of 5 feet. The 2nd semicircle is positioned on the right side of the first one, at the bottom of the first semicircle. The height is 6 feet. We calculated the lateral surface area and added 2 areas of the base. We're pretty sure we have the bases figured out but are having trouble with the lateral surface area part. We were using the formual Lateral Surface Area = perimeter x height and Total Surface Area formula of LA (lateral surface area) + 2 areas of the base. For perimeter of the semicircles, we used the formula pi*diameter/2. The answer is supposed to be 735.1 sq ft but we can only get to 675.1 sq ft and can't find the other 60 sq ft. Thanks!!!!!
Click here to see answer by Alan3354(69443)  |
Question 734377: Please help me solve this equation: it is very important I try it a lot of times and the answers are never the same and thank u for your time
A rectangle is divided into nine squares regions, all are different in size. The area of square 3 is 64 cm2. And the area of square 5 is 81 cm2. What would be the area of the rectangle?
Click here to see answer by stanbon(75887) |
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