I am trying to find the following (marked in red) angle, I know that the radii to the points of contact make an angle θ with the horizontal.
all angles of a triangle add up to 180 degrees.
isosceles triangle, has two equivalent sides
The Attempt at a Solution
I tried using symmetry and found the part in red is [itex]\pi[/itex] - 2[itex]\theta[/itex]
but according to the text, the angle is 2[itex]\theta[/itex]. I am confused on why is is 2[itex]\theta[/itex]