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Fudgin [204]
3 years ago
8

Please Help!! much appreciated! :D Find the value of y.

Mathematics
1 answer:
Ksivusya [100]3 years ago
8 0

In the largest triangle, the missing side has length

√((11 + 5)² - <em>x</em> ²) = √(256 - <em>x</em> ²)

But it's also the hypotenuse of the triangle with side lengths 11 and <em>y</em>, so that its length can also be written as

√(11² + <em>y</em> ²) = √(121 + <em>y</em> ²)

so that

√(256 - <em>x</em> ²) = √(121 + <em>y</em> ²)

or, by taking the squares of both sides,

256 - <em>x</em> ² = 121 + <em>y</em> ²

<em>y</em> ² = 135 - <em>x</em> ²

In the smallest triangle, you have

5² + <em>y</em> ² = <em>x</em> ²   ==>   <em>x</em> ² = 25 + <em>y</em> ²

Substitute this into the previous equation and solve for <em>y</em> :

<em>y</em> ² = 135 - (25 + <em>y</em> ²)

<em>y</em> ² = 110 - <em>y</em> ²

2<em>y</em> ² = 110

<em>y</em> ² = 55

<em>y</em> = √55

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