Question

the perimeter of a rectangle is 30 cm if its breath is 3 cm then its length is ​

Answer 1

Step-by-step explanation:

For Rectangle ,

perimeter = 2 × ( length + breadth )

30 = 2 × ( length + 3 )

15 = length + 3

length = 15 - 3 = 12 cm

Answer 2

Answer :

• Length of Rectangle is 12 cm

Explanation :

• Breadth = 3 cm
• Perimeter = 30 cm

let length be x cm

Use formula for Perimeter of rectangle :

$\longrightarrow \sf{Perimeter \: = \: 2(Length \: + \: Breadth)} \\ \\ \longrightarrow \sf{30 \: = \: 2(x \: + \: 3)} \\ \\ \longrightarrow \sf{30 \: = \: 2x \: + \: 6} \\ \\ \longrightarrow \sf{2x \: = \: 30 \: - \: 6} \\ \\ \longrightarrow \sf{2x \: = \: 24} \\ \\ \longrightarrow \sf{x \: = \: \dfrac{24}{2}} \\ \\ \longrightarrow \sf{x \: = \: 12} \\ \\ \underline{\underline{\sf{Length \: is \: 12 \: cm}}}$

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