4 years ago

How to solve this question?

Mathematics

1 answer:

salantis [7]4 years ago

6 0

Look at the picture.

$\tan\theta=\dfrac{5}{4}\\\\\tan\theta=\dfrac{10}{x}\to\dfrac{10}{x}=\dfrac{5}{4}$

cross multiply

$5x=10\cdot4\\5x=40\ \ \ \ |:5\\x=8\ cm$

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

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