Question

The second angle of a triangle is double the first. The third angle is 40 less than the first. If we denote the first angle of this triangle by 'x' , then the third angle will be

Answer 1

Answer:

1st angle of the triangle is x

then 2nd angle is 2x

third angle is ( x-40)

sum of the three angles of any triangle is 180°

so,

x+2x+x-40=180

=> 4x=180+40

=> x=220/4

=> x=55

so the 1st angle is 55°

2nd angle is 55×2°=110°

and the 3rd angle is( x-40)°=(55-40)°=15°

Answer 2

Answer:

Third angle is 15°

Step-by-step explanation:

x + 2x + x-40 = 180

=>4x-40 = 180

=>x - 10 = 45

=>x = 55

First angle ins 55 °>> Third angle is 40 less than that of first angle ..Hence Third angle is 15°.

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