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having tons of trouble with surface area and volume :(?

 
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AprilD



Joined: 12 Jan 2004
Posts: 3

PostPosted: Wed Nov 15, 2006 12:25 pm    Post subject: having tons of trouble with surface area and volume :(? Reply with quote

1 What is the surface area of the figure?(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer.) https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020314.gifi have no idea how to do that.2 What is the surface area of the figure?(If necessary, round your answer to two places after the decimal point. Use meters for your answer--but do not write units in your answer. Use 3.14 as your value for pi.)https://ecot.iqity.net/clsresshr/class.com/ewew_content/prealg1b/exammedia/020312.gifand how to find the volume of them too! does anyone care to explain Sad 10 points for you Sad c'mon. pweez. PLEASE DO NOT JUST GIVE ME THE ANSWER. as helpful as it may seem, i would rather know how to do it than just pass the test!
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tarkiak



Joined: 07 Dec 2006
Posts: 4

PostPosted: Sat Dec 02, 2006 2:06 pm    Post subject: having tons of trouble with surface area and volume :(? Reply with quote

First check the right triangle with the Pythagorean theorem. It is accurate to one centimetre. (2 decimals paces of one meter)Notice that the top and bottom of the figure would form a rectangle.The surface area of the solid would be the area of this rectangle plus all the areas of the sides.2.5 * 2.2 + (0.54 * (2.5+2.2+3.30))(Be careful with your decimal points.)2)2 sides (top and bottom) plus the circumference times height (0.38 metres).Area of a circle = pi * radius^2= 3.14 * 2.1 * 2.1= 13.85Circumference = 2 * radius * pi= 13.19Area = 13.19 * 0.38= 5.01Total = 2 * 13.85 + 5.01The volumes can be had by multiplying the height times the surface area of either the tops or the bottoms (since the tops and the bottoms are the same.).
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ehwatsup



Joined: 25 Jul 2005
Posts: 4

PostPosted: Tue Dec 19, 2006 3:46 pm    Post subject: having tons of trouble with surface area and volume :(? Reply with quote

1. Surface area is the sum of the areas of each face. The shape is composed of 2 triangles and 3 rectangles. The area of a triangle is 1/2 b*h (since we have 2, the combined area would be b*h) = 2.5m * 2.2m = 5.5 m^2The three rectangles are: .54 * 2.2, .54 * 2.5 and .54 * 3.31.188, 1.35, and 1.782So sum them all up: 1.188 + 1.35 + 1.782 + 5.5 = 9.82 m^22. This surface is 2 circles and a rectangle. The area of each circle is radius^2 * pi = 2.1*2.1*pi = 13.8544 m^2The area of the rectangle is the circumference of the circle * the height of the shape = 4.2pi * .38 = 5.014So sum them together: 13.8544 + 13.8544 + 5.014 = 32.7228 m^2For volume:1. Area of base (triangle) * height = 2.75 m^2 * 0.54m = 1.485 m^32. Area of base (circle) * height = 13.8544 m^2 * .38m = 5.265 m^3I hope this makes sense Smile Best of luck!
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