Question

Am I correct? If not, can you help please?

Answer 1

no you are not a triangle equals 180degrees


31+102=133


180-133= 47
so x=47

Answer 2

Sum of all triangles is equal to 180
So, x + 31 + 102 = 180
x + 133 = 180
x = 180 - 133
x = 47

In short, Your Answer would be 47

Hope this helps!