Sum of the interior angles of a polygon

We were taught that if we let be the angle sum (the total measure of the interior angles) and  be the number of vertices (corners)  of a polygon, then .  For example, a quadrilateral has vertices, so its angle sum is degrees.  Similarly, the angle sum of a hexagon (a polygon with sides) is degrees. […]
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Why do we reverse/flip the inequality sign?

You have probably remembered in Algebra that if we multiply an inequality by a negative number, then the inequality sign should be flipped or reversed. For example, if we want to find the solution of the inequality , we multiply both sides by  and reverse the greater than sign giving us . Now, why did the sign […]
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Problem Set 2

PROBLEMS 1.) Find a linear function such that and . 2.) Solve for : 3.) Prove that the product of consecutive numbers is always divisible by . 4.) Prove that if is prime, and are integers, and , then . SOLUTIONS AND PROOFS Post Date: October 20, 2009 1. Solution: This is just the same as […]
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