Question

Length 21cm area 315cm2 find the breath ​

Answer 1

Breadth = 15 cm

Explanation:

Area = length x breadth

315 = 21 x breadth

`(315)/(21) = (21)/(21) * breadth` [ dividing both sides by 21 ]

`15 = 1 * breadth\\\\breadth = 15 \ cm`

Answer 2

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Symbols of:

`\quad\quad\quad\quad\tt{A = A rea}`

`\quad\quad\quad\quad\tt{ l = length}`

`\quad\quad\quad\quad\tt{ b \: = breadth}`

Given that:

`\quad\quad\quad\quad\tt{A = 315 {cm}^(2) }`

`\quad\quad\quad\quad\tt{l = 21cm}`

`\quad\quad\quad\quad\tt{b = \: ? }`

Formula for breadth (b):

`\quad\quad\quad\quad\tt{breadth = (Area)/(length) }`

Solution:

`\quad\quad\quad\quad\tt{b = \frac{315 {cm}^(2) }{21cm} }`

`\quad\quad\quad\tt{\:\:b = {15cm}}`

So, the breadth (b) is:

`\quad\quad\quad\quad\tt \boxed{ \boxed{ \color{magenta}{b = 15cm }}}`

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