Angles ratio

In an ABC triangle, is 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 answer:

β =  50 °

Step-by-step explanation:

c<b<a ; α>β>γ 9x>5x>4x  β:γ:α= 5:4:9 = 5x:4x:9x α:β:γ = 9x:5x:4x  α+β+γ = 180    x=5+4+9180=10   β=5 x=5 10=50



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