Question

4. The area of a rectangular sheet of aluminium is 400 em? If the breadth of the sheet is
10 cm, find its length. Also find the perimeter of the aluminium sheet.​

Answer 1

Answer:

area of rectangular aluminium sheet is= 400em

breadth of sheet 10 cm

area of rectangle = l.b

400=10×l

l =400÷10

l=40cm

perimeter of rectangle =2(l+b)

=2(10+40)

=2×50

= cm

Answer 2

Answer:

• The length and the perimeter are 40cm and 100 cm²

Step-by-step explanation:

Given:

• The area of a rectangular sheet of aluminium is 400cm²
• If the breadth of the sheet is 10cm

To Find:

• the length and the perimeter

Formulas Used:

• Area of a rectangle = Length × Breadth
• perimeter of a rectangle = 2( L + B )

According to the question:

→ Area of the rectangle = Length ( Breadth )

→ 400cm² = Length × 10cm

→ Length = 400cm² / 10cm

→ Length = 40cm

Henceforth:

• The length of the rectangle is 40cm

Perimeter of the rectangle will be:

→ Perimeter of the rectangle will be = 2( L + B )

→ Perimeter of the rectangle will be = 2 ( 40cm + 10cm )

→ Perimeter of the rectangle will be = 2 ( 50cm)

→ Perimeter of the rectangle will be = 100cm

Therefore:

• The length and the perimeter are 40cm and 100 cm²