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The Solution:
The total degree of the pipe flange is 360 degrees.
It is given that the pipe flange has 10 bolt holes that are equally spaced.
This means that the spacing between the 10 bolt holes can be calculated as below:
Thus, the spacing of the bolt holes (in degrees) is 36 degrees.
Therefore, the correct answer is 36 degrees.
The two marks on the angles A and C suggest that those angle are the same, and thus the triangle is isosceles.
So, if the measure of angle C is x, the measure of angle A will be x as well.
To solve the exercise, we must use the fact that the sum of the interior angles of any triange is always 180°.
In our case, the measures of the angles are 70, x and x, so the equation is