Answered

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Window design. A triangular window on Ross camp's new scary boat has two sides that measure 87 centimeters 64 centimeter, respectively. The perimeter of the triangle must not exceed 291 centimeter. What are the possible values for the length of the third side of the windows?

Sagot :

luana
[tex]x-third\ side\\\\87+64+x<291\\151+x<291\\x<291-151\\x<140\\\\x\in(0,140)[/tex]
olemakpadu
Since the perimeter must not exceed 291.
Let the third side be x.

x + 87 + 64  < 291
x + 151 < 291.
x            < 291 -151.
x   <  140.      (First)

But for a triangle there is what is called the Triangle Inequality Theorem.  That given  the two sides of a tringle, the third side of the triangle must greater than the positive difference between the two sides and less than the sum of the two sides.

So for this case.   87 and 64.

x  > ( 87 - 64).    x  > 23.
x < (87 + 64)      x  <  151. Combine both inequalities.

       23  < x < 151  (second).

Combining First and second. Both must be satisfied.
So we have  a more accurate answer as:


23 < x < 140.      x is greater than 23 and x is less than 140.

x  could be    24, 25, 26, 27, ......, 139.  cm.

I hope this helps.
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