Map Measure - Draw Area & Line

I was trying to measure the area of an irregular polygon where I knew the lengths of the sides. Ideally, I wanted to draw this on a map and measure. It doesn't do that. You can drop pins where you think they belong, but you can't make precise measurements. Apparently Apple won't refund your money unless you spend hours hunting down the developer and getting it in writing the functionality you need doesn't exist. So if this is the functionality you need bypass the expense.