I've been asked by a friend edting a textbook to find the exact dimensions of the Freedom Arches at Nathan Phillips Square. (N43 39'08.23" W79 22'59.63"). I've looked everywhere online and haven't found it. But I'm trying to estimate it from a Google map. Google Earth shows them to be 300 pixels long at a distance of 456ft. I should be able to calculate that dimension in feet using trig - but for the life of me, I can't figure out how. I realise that, if I can fond an object of known length on thje map, I'm home free, but that's fraught with pitfalls and is not the only way I should be able to do it. If I'm trying to calc the height of a triangle, and I know the base length, all I need is the angle. How do I figure out the angle here?