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there are thirty (30) points. To double check, add 1+2+3+4... till 19. Since you are dropping one line for every point connected to all the other lines, you just add the numbers consecutavely from 1 to the second last number of your point. The reason you DON'T add the last number is because you can't connect one point with itself.
I looked up Tudor rose in Google Image Search, and by my count, it actually has 5 lines of symmetry. Each line starts from one of the tips and cuts the rose in half. It is similar to a regular pentagon.
To draw a semi cardinal point, first identify the main cardinal directions: north, south, east, and west. The semi cardinal points are the intermediate directions: northeast (NE), southeast (SE), southwest (SW), and northwest (NW). On a compass rose, position these points halfway between the cardinal points, ensuring each is equidistant from its neighbors. Use clear lines or arrows to connect them to their corresponding cardinal directions for clarity.
Since the Rose Bowl could hold approximately 84,375,000 gallons of water (if it were sealed) according to the Rose Bowl's website (http://www.rosebowlstadium.com/RoseBowl_general-info.htm), that equals about 259 acre-feet of water.
... and the point being ...