# Angles ratio

In a triangle ABC true relationship c is less than b and b is less than a. Internal angles of the triangle are in the ratio 5:4:9. The size of the internal angle beta is:

Correct result:

β =  50 °

#### Solution:

$\beta =5\mathrm{/}\left(5+4+9\right)\cdot 180=5{0}^{\circ }$

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