Question

if you have brain, answer this question
The length of a rectangle is 4 less than thrice its breadth. If its perimeter is 40 cm,
find its dimensions.​

Answer 1

Answer:

Breadth = 6cm

Length = 14cm

Step-by-step explanation:

Given:

Perimeter = 40 cm.

We know,

$p = 2(l + b)$

Also given,

$l = 3b - 4$

Thus, we can say,

$p = 2(3b - 4 + b) \\ = > \frac{40}{2} + 4 = 4b \\ = > b = \frac{24}{4} \\ = > b = 6cm(ans - b) \\ \\ \\ \\ l = 3(6) - 4 \\ = > l = 18 - 4 \\ = > l = 14cm(ans - l)$

Hope this helps. ^_^