Is there a picture? or model?
Answer:
We will take two angles and name them 'x'
And their sum must equal 180
So,
x + x = 180
2x = 180
x = 180/90
x = 90
Hence, it is proved that the bisector of the vertical angle of isosceles triangle is the perpendicular bisector of the base.
The service fees differ by $1. The per-check fees differ by $0.01. A person would have to write 1/.01 = 100 checks for the two accounts to cost the same.
