Question

What is the value of x?
56
46
67
134

Answer 1

The sum of the interior angles of a triangle will always equal 180 degrees. We can subtract the two known angles from 180 to find the measure of the third angle.
180 - 63 - 71 = 46

The correct measure of x would be B. 46 degrees.

Hope this helps =)

Answer 2

Interior angles of all triangles add to equal 180 degrees.
Since you are given two angle measures and need to find the third, you can set the sum of all angle measures equal to 180 and solve for the missing angle measure.

180 = 63 + 71 + x
180 = 134 + x
46 = x

Answer:
x = 46