Math, asked by shatrughanray82, 7 days ago

33. एक निश्चित आयत का परिमाप 76 और क्षेत्रफल 360 है,
तो इसके सबसे छोटी भुजा की लम्बाई क्या है:
(A) 12
(C) 18
(B) 20
(D) 36​

Answers

Answered by aishwarya2323
0
36 ur answer maybe
Nhi to ..g..oo..gle
Answered by bhagyashreechowdhury
0

Given:

एक निश्चित आयत का परिमाप 76 और क्षेत्रफल 360 है,  

To find:

तो इसके सबसे छोटी भुजा की लम्बाई क्या है

Solution:

Let "l" and "b" be the length and breadth of the given rectangle respectively.

The area of the rectangle = 360 unit²

l \times b = 360

\implies l = \frac{360}{b}

The perimeter of a certain rectangle = 76 units

2(l + b ) = 76

\implies (l + b ) = 38

\implies ( \frac{360}{b} + b ) = 38

\implies 360 + b^2 = 38 b

\implies b^2 - 38b + 360 = 0

\implies b^2 - 20b - 18b + 360 = 0

\implies b(b - 20) - 18(b - 20) = 0

\implies (b - 20) (b - 18) = 0

\implies b = 20 \:or\:18

When b = 20 then l = \frac{360 }{20} = 18

Similarly, When b = 18 then l = \frac{360 }{18} = 20

Thus, the length of the shortest side is → 18 units.

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