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9. Find the length of a side of the square if its area is numerically equal to ten times its perimeter.​

Sagot :

♕ Answer

The length of the side is 40.

Solution:

We know that

  • the perimeter P of a square is four times the length of the side, and
  • the area A of a square is the square of its sides.

Given that the area of a square is ten times its perimeter, we find the length of the side by solving for s,

  • [tex]{\tt{A=10(P)}}[/tex]
  • [tex]{\tt{s^{2}=10(4s)}}[/tex]
  • [tex]{\tt{s^{2}=40s}}[/tex]
  • [tex]{\tt{{\frac{s^{2}}{s}}={\frac{40s}{s}}}}[/tex]
  • [tex]{\boxed{\green{\tt{s=40}}}}[/tex]

To check:

  • [tex]{\tt{A=10(P)}}[/tex]
  • [tex]{\tt{s^{2}=10(4s)}}[/tex]
  • [tex]{\tt{s^{2}=40s}}[/tex]
  • [tex]{\tt{(40)^{2}=40(40)}}[/tex]
  • [tex]{\underline{\tt{1,600=1,600}}}[/tex]

❤︎Tsareena

[tex]{\huge{\underline{\sf{Hope\:It\:Helps}}}}[/tex]

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