Question

A cube with edge 12 cm long is to be painted on all the six sides. Find
the cost of painting at 36 per cm
​

Answer 1

Given

• A cube with edge 12 cm long is to be painted on all the six sides.

To find

• The cost of painting it at the rate of 36 per cm

Solution

Using formula,

Total surface area of the cube = 6 × side²

Substituting the values,

⟶ 6 × 12²

⟶ 6 × 144

⟶ 864 cm²

Total surface area of cuboid = 864 cm²

The cost of painting the cube at the rate of Rs. 36 per cm² = 864 × 36 = Rs. 31,104

___________________________

Some formulae :

• Volume of cube = side³
• Perimeter of cube = 12 × side
• Area of square = side × side
• Perimeter of square = 4 × side
• Diagonal of square = √2a
• Perimeter of reactangle = 2(l + b)
• Diagonal of rectangle = √l² + √b²
• Total surface Area of cuboid = 2(lb + bh + hl)
• Volume of cuboid =  length × breadth × height
• Perimeter of cuboid = 4 (length + breadth + height)

Answer 2

Answer:

rs 31,104

Step-by-step explanation:

perimeter = 6 × 12^2

=864 cm

cost = 864×36

=31,104