Total Surface Area of a Cuboid:
Total surface area of cuboid= , where,
l is the length of cuboid, b is the breadth of cuboid and h is the height of the cuboid.
Illustration: An indoor greenhouse is made entirely of glass panes held together with tape. It is 30cm long, 25cm wide, and 25cm height. Find the area of the glass?
Solution: We have, Length=30cm, Breadth=25cm and Height=25cm
Area of glass = Total surface area of cuboid =
= 2 (30 x 25 + 25 x 25 + 30 x 25)
= 2(750 + 625 + 750)
=
Illustration: A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is to be open at the top. Ignoring the thickness of the plastic sheet, determine:
(i) The area of the sheet required for making the box.
(ii) The cost of the sheet for it, if a sheet measuring costs Rs 20.
Solution: We have,
l = Length of plastic box = 1.5 m
b = Breradth of plastic box = 1.25 m
h = height of plastic box = 65 cm = 65/100 = 0.65 m
Total surface area of the plastic box = lb + 2(bh + hl)
=
Hence the area of the sheet required for making the box is
(ii) Since sheet costs Rs 20. Therefore,
Cost of sheet required for making the box = Area of the sheet X Rate per sq. metre
= Rs (5.45 X 20)
= Rs 109
If the length, breadth and total surface area of a cuboid are 3 cm , 4 cm and 94 cm sq respectively, then the height of the cuboid is equal to : | |||
Right Option : C | |||
View Explanation |
If the length, height and total surface area of a cuboid are 11 cm, 6 cm and 404 cm sq respectively, the breadth of the cuboid is equal to : | |||
Right Option : D | |||
View Explanation |
Find the surface area of a slab of stone measuring 4 metres in length , 2 metres in width and 1/2 metres in thickness. | |||
Right Option : D | |||
View Explanation |
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
A marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.