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AREAS AND VOLUMESA plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at theIgnoring the thickness of the plastic sheet, determine:The area of the sheet required for making the box.The cost of sheet for it, if a sheet measuring 1m² costs 20.The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find thecost of white washing the walls of the room and the ceiling at the rate ofThe floor of a rectangular hall has a perimeter 250 m. If the cost of painting the fourwalls at the rate of 10 per mais * 15000, find the height of the hall.(Hint: Area of the four walls = Lateral surface area.]4. The paint in a certain container is sufficient to paint an area equal to 9.375 m². HowMATHEMATICEXERCISE 13.1213top37.50 per m2bricks of dimensions 22.5 cm x 10 cm x 7.5 cm can be painted out of thismanycontainer?A cubical box has each edge 10 cm and another cuboidal box is 12.5 cm long, 10 cmwide and 8 cm high.ch( Which box has the greater lateral surface area and hy hom |
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Answer» Answer: Hello I think this may HELP you Step-by-step explanation: Surface area of the solid object is measured of the Total surface area that is is TSA Given: Length of plastic box (l)=1.5m Width of plastic box (b)=1.26m Depth of plastic box(h)=65cm= 65/100=0.65m 1)The area of SHEET required to make the box=surface area of the box INCLUDING the BASE&top Surface area of the box=lateral surface area+Area of the base =2(l+b)×h+(l+b) =2[(1.5+1.25)×0.65]+(1.5×1.25) =2(2.75)×0.65+1.875 =3.575+1.875=5.45m² Hence the sheet required to make the box is 5.45 m² Thank you |
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