If for a given initial velocity, the maximum range is at a projection angle of 45, then there must be equal ranges for angles above and below this.

If for a given initial velocity, the maximum range is at a projection angle of 45˚, then there must be equal ranges for angles above and below this. Did your experimental data support this? Explain: As an example look at the range for 30 and 60 degrees or for 75 and 15 degrees.