Answer:
Without more context or information, it's difficult to determine the specifics of Dexter's claim. However, if the claim is that the value of x can only be found using vertical angles, this claim would be incorrect.
While vertical angles can be used to find the value of x, there are other methods to find this value as well. One such method involves using the fact that angles in a triangle add up to 180 degrees. If we know the measures of two angles in a triangle, we can find the measure of the third angle by subtracting the sum of the other two angles from 180 degrees.
For example, if we have a triangle with angles measuring 40 degrees and 80 degrees, we can find the measure of the third angle as follows:
Third angle = 180 - (40 + 80)
Third angle = 60 degrees
Therefore, if we have a triangle with one angle measuring 40 degrees, we can use this method to find the value of x without using vertical angles. We would just need to know the measures of the other two angles in the triangle.
Explanation: