Why is the sum of the angles in a square 360 degrees?

What is a negative 15 divided by a negative 5? If Susie paid e dollars for a wallet after she was given 20 percent discount What was the original cost of the wallet? What are the properties of a triangular pyramid have? What is 3 over 5 multiplied by 6? What is is the prime factorization of 4560? What is the product of m and 23 in math? How many gallons of crude oil are in 1 million tons? Is four twelfths in simplest form? What is 72 divided into 8? Why should you clear fractions when solving liner equations and inequalities? How many sq feet to cover a 9x9 space? How many 7 11 are there? How many lines of symmetry does number 8 have? Why are manholes in circles and not in square or rectangle? What Bible verse tells you not to limit yourself because of your age? What does 90 times 90 equal? How many mml is 8.25kg? What is 1000 miles per hour in kilometres? Are the interior angles in a polygon equal in measure? What verse is repeated most in the Bible?