So, I'm writing a book and I'm trying to be really detailed. Right now I'm writing a wiki of it and I want to specify the areas of continents and cities.
But I'm having a lot of trouble doing this. I'm not good at math and the shapes are complex, so I won't find an equation to solve everything.
Is there a way to solve this? More than just the answers, I really need to understand so I can calculate this alone later.
If it helps, each one of the rectangles in the grid have 3 million km² (I built it in Illustrator with 1cm height and 2cm width).