Question

A triangle has three angles which we call the first second and third angle here. The second angle is twice the first angle. The third is angle is 51 degree what is the value of first angle
​

Answer 1

Answer:

Let, the first angle be x

and the second angle be 2x

third angle given as 51°

Sum of all angles= 180°

Therefore, X+2x+51= 180

→ 3x= 180-51

→ X= 129/ 3

→ X= 43

So, first angle is 43°

second angle is 2× 43= 86°

Answer 2

Answer:

43°

Step-by-step explanation:

We know, angle 1+angle 2+angle 3= 180°

Angle 3= 51°

=> Angle (1+2)=180°-51°=129°

Now if Angle 1= x, angle 2 will be 2x

=> x+ 2x = 129°

=> 3x= 129°or x= 129°/3=> x= 43°

Therefore, the value of the first angle = 43°

Second angle = 2x= 2× 43°= 86°