Question

two angles of a triangle are in the ratio 4:5 if the sumof these angles is equal to the third angle, find the angle of a triangles
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Answer 1

Answer:

Let the two angles of the triangle be 4x and 5x.

Then, as per the question, we know

third angle =4x+5x=9x

We know that sum of all the angles of a triangle is 180

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.

∴4x+5x+9x=180

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⇒18x=180

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⇒x=10

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....[On dividing both sides by 18]

So, first angle = 4x

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= 4×10

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=40

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,

second angle = 5x

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= 5×10

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=50

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and

and third angle = 9x

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= 9×10

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=90

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Answer 2

Step-by-step explanation:

let the third angle be x

so,4x+5x+x=180

10x=180

x=18

so,1st angle = 72

2nd angle= 90

3rd angle = 18