I have got hliday homework for maths. I have Oxford New Syllabus Mathematics 1 (Fifth edition), It has a blue greenish sort of cover. I have got homework to finish the Review questions of Ch.10. I am half way through, but I don know how to do Q.11 of it. Plz tell me how to solve it. Here is the questiion.
How many cubic metres of concrete is needed to surround a rectangular pond 4.25 metres by 4 metres, with a border 0.25 metres wide and 18 cm thick?
2006-07-17 01:51:56 · 8 answers · asked by Faizan 1 in Science & Mathematics ➔ Mathematics
PLz tell the procedure
2006-07-17 01:58:27 · update #1
First we find the area of the concrete. The pond is 4.25 m by 4 m, so the pond + border is 4.75 m by 4.5 m (add .25 meters to each side for a total of .5 meters in each dimension). Thus the total area of the concrete is (4.75*4.5)-(4.25*4)=4.375 m². Multiply by .18 m in height to get your volume of 0.7875 m³.
2006-07-17 01:58:36 · answer #1 · answered by Pascal 7 · 1⤊ 0⤋
4.75(4.25 +.25+.25) & 4.5(4+0.25+0.25) are the dimensions of the external rectangle.
Area of the outer rectanle -inner rectacngle =(4.75*4.5)-(4*4.25)= 4.375 m square
This area * thickness = concrete required
4.375* 0.18 =0.79 m cube
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this way you will have four square shaped area left at each of the corner ,so it's wrong !
I am always right !
2006-07-17 08:59:57 · answer #2 · answered by Nihilist 3 · 0⤊ 0⤋
look at the borders as 4 pillars laying down.
2 pillars are 4m x 0.25m x 0.18m
the other 2 pillars are Length =>(4.25m + 0.25m + 0.25m) x 0.25m x 0.18m.
Add the volume of the four Pillars and that should be the Volume required.
I'd do it for you but it is your homework after all.
2006-07-17 09:04:34 · answer #3 · answered by Odie 5 · 0⤊ 0⤋
I doubt anyone will do your homework for you. This is an easy arithmetic problem.
cubic volume is LxWxD...
Surely you can convert centimeters to meters and vice versa...
2006-07-17 08:55:59 · answer #4 · answered by crazyotto65 5 · 0⤊ 0⤋
Leave thy homework enjoy thy vacation
2006-07-17 09:13:19 · answer #5 · answered by sikandar 2 · 0⤊ 0⤋
(4.25+.25) * (4+.25) *.018 - 4.25 * 4 *.018=.04
Total Area w/ border - inside area of pond
18 cm. = .018 m
2006-07-17 09:10:42 · answer #6 · answered by sarahboberra91 2 · 0⤊ 0⤋
Tell the teacher that you have ADS, & went out to play on your bike
2006-07-17 09:20:31 · answer #7 · answered by intel_inside44 3 · 0⤊ 0⤋
skip it
2006-07-17 08:55:56 · answer #8 · answered by Gabriel 3 · 0⤊ 0⤋