Question

Which one is the answer

Answer 1

Answer :

3x = 78 + x - 2

Explanation :

We know that, exterior angle is the sum of interior opposite angles of a triangle.

•°• 3x = 78 + x - 2

Here, 3x is the exterior angle of ∆

78 + x - 2 is the sum of interior opposite angles.

Let's find the value of x now.

3x = 78 + x - 2

=> 3x - x = 78 - 2

=> 2x = 76

=> x = 76/2

=> x = 38

So, that's how we use this equation to find the value of x.

Answer 2

$\boxed{ \green{ \bf3x = 78 + x - 2}}$

Because sum of two interior angle is always equals to opposite exterior angle

$\pink{ \bf To \: find \: value \: of \: x : }$

$3x = 78 + x - 2 \\ \\ 3x - x = 76 \\ \\ 2x = 76 \\ \\ x = \frac{76}{2} \\ \\ \large \boxed{ \green{\bf x = 38 }}$