Question

A 180 cm long wire is formed into a rectangle. If the width of this rectangle is 30 cm, what is its length?

• A. 45 cm
• B. 60 cm
• C. 90 cm
• D. 120 cm

Answer 1

Answer:

B. 60 cm

Given:

The length of the wire = 180 cm

The width of the rectangle = 30 cm

Formula used:

Perimeter of the rectangle $= 2\times{(l + b)}$

Here l → Length, b → breadth

Calculation:

Let the length of the rectangle be l cm

According to the question

Perimeter of the rectangle $= 2\times{(l + b)}$

⇒$2\times{(l + 30)} = 180$

⇒ l + 30$=\frac{ 180}{2}$

⇒ l + 30 = 90

⇒ l = 90 – 30

⇒ l = 60

∴ The length of the rectangle is 60 cm