Question

The perimeter of a rectangle plank is 120 cm. If the length is 40 cm , find its breadth and surface area of the plank.

Answer 1

Answer -

Breadth is 20cm and Area is 800 sq.cm

Explaination :

★ Given :

→ The perimeter of the plank is : 120 cm

→ Length : 40cm

★ To find :

• Breadth of the plank

• Area of the plank

Solution :

$\textbf{Breadth\:of\:the\:plank}$

Consider the Breadth as b

→ Perimeter of RECTANGLE = 2 (l + b)

$= > 120 = 2(40 + b)$

$= > 120 = 80 + 2b$

$= > 2b = 120 - 80$

$= > 2b \: = 40$

$= > b \: = \frac{40}{2}$

$= > b = 20$

$\large{\green{\boxed{\green{\boxed{\red{\textsf{The Breadth = 20 cm}}}}}}}$

$\textbf{Area\:of\:the\:plank}$

→ AREA of Rectangle = L × B

$= > 20 \times 40$

$= > 800$

$\large{\green{\boxed{\green{\boxed{\red{\textsf{The Area = 800 sq.cm}}}}}}}$

Ans: Breadth is 20cm and Area is 800 sq.cm