Respuesta :

animalsarecute

Well we know the sum of all the angles on a triangle is 180.

And we already know 2 of the sides: 102 and 31. So add them up and subtract it from 180.

102 + 31 = 133.

180 - 133 = 47.

So "x" is 47.

zombobly

Answer:

x = 47

Step-by-step explanation:

The sum of the 3 angles of a triangle always add up to 180, therefore...

31 + 102 + x = 180

Add like terms.

133 + x = 180

Subtract 133 from both sides.

x = (180 - 133) = 47