Question

Please help me and solve it with full explanation and solution​

Answer 1

Step-by-step explanation:

let length be 'l'

acc to question

l x l/3 = 1200 m² ( area of rectangle)

l²/3=1200

l² = 3600

√l² =√3600

l= 60.

therefore length of room is option (a) 60 m

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Answer 2

Solution :

★ Here, given that

• Breadth of a rectangular room is one third of it's length.
• Area of the room is 1200m².

★ Let

• Length of the rectangular room = k
• Breadth of the rectangular room = k/3

★ Formula used

• Area of a rectangle = length × breadth

★ Now, according to question :

➥ Area of the rectangular room = length × breadth

➥ Area of the rectangular room = k × k/3

➥1200 = k²/3

➥ k² = 1200 × 3

➥ k² = 3600

➥ k = √3600

➥ k = 60cm

★ Now, put the values

• Length of the rectangular room = k => 60cm
• Breadth of the rectangular room = k/3 = 60/3 => 20cm

Hence, the length of the rectangular room is 60cm.