3 years ago

Help Mehhhhhhh!!!!!!

Mathematics

1 answer:

kolbaska11 [484]3 years ago

4 0

Answer:

its 20 :D Can you help me with this queston

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Answer:

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Step-by-step explanation:

Given:

Consider In Right Angle Triangle ABC

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AB = y

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To Find:

x = ?

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Solution:

In Right Angle Triangle ABC by Cosine Identity we have

$\cos C = \dfrac{\textrm{side adjacent to angle C}}{Hypotenuse}\\$

substituting the above given values we get

$\cos 45 = \dfrac{BC}{AC}=\dfrac{x}{8}$

$\dfrac{1}{\sqrt{2} } =\dfrac{x}{8}\\\therefore x=\dfrac{8}{\sqrt{2} } \\Rationalizing\ we\ get\\\therefore x=\dfrac{8}{\sqrt{2}}\times \dfrac{\sqrt{2} }{\sqrt{2}}}\\\therefore x=4\sqrt{2}=4\times 1.4142=5.6568\ units$

As The triangle is 45 - 45 - 90

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Therefore,

$x=y= 4\sqrt{2}=5.6568\ units$

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