a)
The angles outside the circle must add up to 360 degrees (since they are all angles that intersect the circle).
So, (8x - 10) + (6x) + (10x + 10) = 360
Simplifying, we get 24x = 360
Dividing by 24, we get x = 15
b)
To determine if the triangle is equilateral, isosceles, or scalene, we need to compare the side lengths.
Since we only have information about the angles and not the side lengths, we cannot definitively say if the triangle is equilateral, isosceles, or scalene.