Advertisements
Advertisements
प्रश्न
Find the surface area of a cube whose edge is 2.1 m.
Advertisements
उत्तर
\[\text { Edge of the a cube = 2 . 1 m } \]
\[ \therefore\text { Surface area of the cube = 6 } \times \text { (side )}^2 = 6 \times (2 . 1 )^2 = 6 \times 4 . 41 = 26 . 46 m^2\]
APPEARS IN
संबंधित प्रश्न
Find the volume of a cube whose side is 8 cm .
Find the surface area of a cube whose edge is 6 m .
Cubes A, B, C having edges 18 cm, 24 cm and 30 cm respectively are melted and moulded into a new cube D. Find the edge of the bigger cube D.
The volume of a cube is 729 cm3. Find its total surface area.
The internal length, breadth, and height of a box are 30 cm, 24 cm, and 15 cm. Find the largest number of cubes which can be placed inside this box if the edge of each cube is
(i) 3 cm (ii) 4 cm (iii) 5 cm
When the length of each side of a cube is increased by 3 cm, its volume is increased by 2457 cm3. Find its side. How much will its volume decrease, if the length of each side of it is reduced by 20%?
The dimensions of a solid metallic cuboid are 72 cm × 30 cm × 75 cm. It is melted and recast into identical solid metal cubes with each edge 6 cm. Find the number of cubes formed.
Also, find the cost of polishing the surfaces of all the cubes formed at the rate Rs. 150 per sq. m.
The ratio between the lengths of the edges of two cubes is in the ratio 3: 2. Find the ratio between their:
(i) total surface area
(ii) volume.
A cuboid is 25cm long, 15cm board and 9cm high. Find the whole surface of a cube having its volume equal to that of the cuboid.
Three metal cubes with edges 6cm, 8cm and 10cm respectively are melted together and formed into a single cube. Find the diagonal of this cube.
