There can be 8, 10, 16, 32. And more with more precision instruments.
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It has one vertical line of symmetry
I would think it would have two. One horizontal and one vertical.
The letter F has two vertical lines. The uppercase F consists of a single vertical line and two horizontal lines connecting to it. The lowercase f also has two vertical lines - one straight down and one shorter line extending from the top.
I believe it is 72 points. 95 percent sure.
No. The non-vertical angles need not be related to one another in any way.