What is the rotational symetry of an arrowhead?

What is An act of violence can be described as a logical progression in microseconds except for? What was her starting number if Jan doubled her starting number added 5 subtracted 7 divided by 3 then squared the result? Why trucks have 6-8 tyres? How many years are in a chiliad if a decade is ten years and a century is hundred years? What is 55 percent of 70? What number is larger the 12 but smaller then 40? If the probability of flipping a coin is one half than why don't you get heads half the time? Which fuse number is for the AC system on a 2002 Jetta TDI? What is 145 minus 40 percent? How many inches in one quarter yard? Why isn't there a Nobel Prize for math? What is the difference between deca and Deci? What does wbc of 16.3 mean? How do you find the city name by its coordinates? Who were the first people to use fractions? What do you call the cycle of seasons and feasts celebrating the presence of Jesus Christ with us all the time and the events in his life? What is the circle with a dot in the middle of the ring? How many square centimeters are there in 3.6 square meters? What has the author Roman Garrison written? What is 15 by 13 feet in square meters?