Surface Area of a Cube
Surface Area of a Cube
Surface Area of Cube: All the six faces of a cube are squares of the same size. i.e. for a cube we have l=b=h. Thus, if l cm is the length of the edge or a cube, then to calculate the total Surface Area of Cube we have to add the sum of area of all the faces of a cube.
Example:- Find the surface area of cube whose edge is 11cm.
Solution:- We know that the surface area of a cube=
Here, edge=11cm
Surface area of the given cube=
Example: Find the edge of a cube whose surface area is 1350 sq cm
Solution: Let the edge = x cm
Surface area of Cube is = 1350 sq cm
x= 15 cm
Example: A cubical box is to be painted on all the side.Find the cost of painting when the rate of painting 1sq cm. is Rs.5. The side of the cube is 16 cm
Solution: Side of a cube = 16 cm
Surface area of the cube =
If the lateral surface area of a cube is 64 cm sq, its total surface area is equal to : | |||
| Right Option : C | |||
| View Explanation | |||
If each edge of a cube is increased by 25%, then the percentage increase in its surface area is _________________ | |||
| Right Option : D | |||
| View Explanation | |||
A cubical box is to be painted on all the side. Find the cost of painting when the rate of painting of 1sq cm. is Rs.7. The side of the cube is 21 cm. | |||
| Right Option : C | |||
| View Explanation | |||
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