A logarithmic function is an appropriate model because, for evenly spaced y-values, the <u>ratio</u> of consecutive x-values is constant. This is the correct answer to your question.
Angles in a traingle always add up to 180°. in an isosceles triangle, 2 of the angles are the same, so if one angle is 100°, the other 2 must be 180-100=80/2=40 the other 2 angles would be 40° and 40°