Question

If 160 L of molten
metal is cast into 20
identical cubes, how
many litres of paint
will be required to
paint all the cubes
completely with
uniform thickness of
1 cm?​

Answer 1

Answer:

Explanation:

• Length of boundary of a simple closed figure is known as perimeter.

• Area is the measure of region enclosed in a simple closed curve.

• Perimeter of a rectangle = 2 (length + breadth).

• Area of a rectangle = length × breadth.

• Perimeter of a square = 4 × side.

• Area of a square = side × side.

• Area of a triangle =

1

2 × Base × Corresponding Height.

• Area of a parallelogram = Base × Corresponding Height.

• Area of a circle = 2 r , where r is the radius.

• Area of a trapezium =

1

2 × (Sum of parallel sides) × Height.

• Area of a rhombus =

1

2 × Product of diagonals.

• Lateral surface area of a cube = 4 (side)2.

• Total surface area of a cube = 6 (side)2.

• Lateral surface area of a cuboid = 2 × height × (length + breadth).

• Total surface area of a cuboid = 2(lb + bh + hl).

• Lateral (curved) surface area of a cylinder = 2πrh.

• Total surface area of a cylinder = 2πr (r + h), where r is the radius

and h is the height.