In an isosceles triangle with one base angle of 60 degrees and the other labeled 3x degrees, we can find the value of x by setting up an equation and solving for x. By using the fact that the sum of the angles in a triangle is 180 degrees, we can find that x = 20. So, the correct option is B.
An isosceles triangle has two equal base angles. In this case, one base angle is labeled 60 degrees and the other is labeled 3x degrees.
Since the sum of the angles in a triangle is 180 degrees, we can write the equation: 60 + 60 + (3x) = 180.
Simplifying the equation, we have: 120 + 3x = 180.
Subtracting 120 from both sides, we get: 3x = 60.
Dividing both sides by 3, we find that x = 20.
Therefore, the value of x is B. 20.
The probable question may be:
"What is the value of x?
A. 15
B. 20
C. 60
D. 180
An isosceles triangle with base angles labeled 60 degree and the other labeled open parenthesis 3 x closed parenthesis degree."