Question

Find out five two- dimensional and three dimensional objects each from household items which you use daily. Find out their volumes and surface areas.

Answer 1

the five two dimensional objects are : 1. double bed sheet , the dimensions are 2.5 metre is to 2.5 metre therefore area = length x breadth = 2.5 x 2.5 m² = 6.25m²
2. bath towel, length = 1m  and breadth = 0.5 m , so the area = 1 x 0.5 m² = 0.5 m²
3. table mats , length = 25 cm , breadth = 20 cm , so the area = 25 x 20 cm²=  500 cm²
4. dining table cover , length = 2m , breadth = 1m , so the area = 2 x 1 m²= 2m²
5. handkerchiefs , length = 15 cm , breadth = 15 cm , so the area = 15 x 15 cm² = 225cm²

the three dimensional objects of daily use are 
1. steel almirah , length = 1m , height = 2m , breadth = 0.5 m , the volume = length x breadth x height = 1 x 2 x 0.5 m³ = 1 m³
2. glass for drinking water , radius of the base = 2cm , height  = 7cm , so area of the base = πr² = 3.14 x 2² = 12.56 cm² , volume = area of the base x height = 12.56 x 7 cm³ = 87.92 cm³
3. cell phone , L = 10cm , b = 5cm , h =0.5 cm , volume = L x b x h = 10 x 5 x 0.5 cm³ = 2.5 cm³
4. book , l = 20cm , b = 10 cm ,   h = 4 cm , volume =  l x b x h = 20 x 10 x 4 cm³ = 800 cm³
5.  Tiffin box , l= 10 cm , b = 10 cm h = 5 cm , volume = l x bx h = 10 x10 x 5cm³ = 500 cm³. 

Answer 2

Answer:

Step-by-step explanation:

the five two dimensional objects are : 1. double bed sheet , the dimensions are 2.5 metre is to 2.5 metre therefore area = length x breadth = 2.5 x 2.5 m² = 6.25m²

2. bath towel, length = 1m  and breadth = 0.5 m , so the area = 1 x 0.5 m² = 0.5 m²

3. table mats , length = 25 cm , breadth = 20 cm , so the area = 25 x 20 cm²=  500 cm²

4. dining table cover , length = 2m , breadth = 1m , so the area = 2 x 1 m²= 2m²

5. handkerchiefs , length = 15 cm , breadth = 15 cm , so the area = 15 x 15 cm² = 225cm²

the three dimensional objects of daily use are  

1. steel almirah , length = 1m , height = 2m , breadth = 0.5 m , the volume = length x breadth x height = 1 x 2 x 0.5 m³ = 1 m³

2. glass for drinking water , radius of the base = 2cm , height  = 7cm , so area of the base = πr² = 3.14 x 2² = 12.56 cm² , volume = area of the base x height = 12.56 x 7 cm³ = 87.92 cm³

3. cell phone , L = 10cm , b = 5cm , h =0.5 cm , volume = L x b x h = 10 x 5 x 0.5 cm³ = 2.5 cm³

4. book , l = 20cm , b = 10 cm ,   h = 4 cm , volume =  l x b x h = 20 x 10 x 4 cm³ = 800 cm³

5.  Tiffin box , l= 10 cm , b = 10 cm h = 5 cm , volume = l x bx h = 10 x10 x 5cm³ = 500 cm³.