Question

4. The area of a rectangular sheet of aluminium is 400 cm². If the breadth of the sheet is
16 cm, find its length. Also find the perimeter of the aluminium sheet.
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Answer 1

Answer:

Area=400 cm²

breadth=16cm

length=400/16=25cm

perimeter=2(l+b)

2×(16+25)

2×41

82cm

Answer 2

Answer:

• Length of rectangular aluminum sheet is 25 cm.
• Perimeter of rectangular aluminum sheet is 82 cm.

Step-by-step explanation:

Given :-

• Area of rectangular sheet of aluminum is 400 cm².
• Breadth of aluminum sheet is 16 cm.

To find :-

• Length of aluminum sheet.
• Perimeter of aluminum sheet.

Solution :-

Area of rectangle = Length × Breadth

Put area and breadth in formula :

$\longrightarrow$ 400 = Length × Breadth

$\longrightarrow$ 400 = Length × 16

$\longrightarrow$ 400/16 = Length

$\longrightarrow$ Length = 25

Thus,

Length of rectangular aluminum sheet is 25 cm.

We know,

Perimeter of rectangle = 2(Length + Breadth)

Put Length and Breadth in formula :

$\longrightarrow$ Perimeter = 2 × (25 + 16)

$\longrightarrow$ Perimeter = 50 + 32

$\longrightarrow$ Perimeter = 82

Therefore,

Perimeter of rectangular aluminum sheet is 82 cm.