# Reflections

Essay by PaperNerd ContributorCollege, Undergraduate March 2002

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Algebra 2: Reflections V.1 Today in Algebra 2 we learned how to find the missing side of a right angle with 2 sides given. We used Sine, Cosine, and Tangent. I learned that when we have an angle and a side, we first, label the triangle with hypotenuse opposite and adjacent. Then we need to figure out which trigonometry to use; sine, cosine, or tangent. Sine is opposite over adjacent, cosine is adjacent over hypotenuse, and tangent is opposite over adjacent.

Ex.

Today in Algebra 2 we did a bubble diagram of Patterns and Recursions. I learned that recursion is a formula, which we use to dissect patterns. There are 3 types of recursions: Geometric, arithmetic, or neither.

Ex. of recursion format: Today in Algebra 2 we did real-world problems of using recursion. We got together in groups and did Investigations: 1.2.1 and 1.2.2. 1.2.1 was called, "Pyramid Investment Plan."

The plan was to send out letters to people and hope that they would respond by sending \$20 back, and become part of the chain, in hopes to someday. Investigation 1.2.2 was called, "Investing with Meg Abux." In this investigation we calculated the amount of money, gained off the interest of \$2000 at various times.

Ex: Today in Algebra 2 we continued with our Recursion and Pattern practice and we took a test (which I failed). We did an Investigation, which was just for notes called, "Color Concentration." There was a bowl of liquid that started out with 984 ml of clear water. The amount of colored liquid was 16 ml. We continued to take down the progress of that experiment on a table.

Here is an example of the Recursion formula we used: