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12-08-2018
Mathematics

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12-08-2018

Look at the picture.

[tex]\tan\theta=\dfrac{5}{4}\\\\\tan\theta=\dfrac{10}{x}\to\dfrac{10}{x}=\dfrac{5}{4}[/tex]

cross multiply

[tex]5x=10\cdot4\\5x=40\ \ \ \ |:5\\x=8\ cm[/tex]

|QR| = 13cm + 8cm = 21 cm

Ver imagen gmany

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