## Introduction: Rock, Paper, Scissors Math Game to Teach Angles

The purpose of this Instructable is to help students distinguish between Acute, Obtuse, Right & Straight Angles by playing a variation of Rock, Paper & Scissors. Your students will love it!

## Step 1: Mathematical Note About Rock, Paper & Scissors

Note: Most rock, paper, scissor games are played with an odd number of choices in order to optimize game play. This insures that each move (rock, paper or scissors) has the same probability of winning. I choose to use four choices obtuse, acute, right and straight because they are the most common classification of angles that students must learn. Using an even number of choices creates some uneven outcomes and alters the strategy of game play, but this can be overlooked since the ultimate goal is for students to learn the concepts as opposed to being the winner

## Step 2: How the Game Works

The game-play is similar to Rock, Paper & Scissors except the hand gestures have changed. We will detail the hand gestures in the upcoming steps but this step details how rock, paper & scissors is played.

****Note: If you are familiar with how to play rock, paper & scissors, feel free to skip this step**

How to play Rock Paper & Scissors?

Taken from e-how
http://www.ehow.com/how_2051016_play-rock-paper-scissors.html

## Step 3: Obtuse Angle Hand Gesture

Here is the hand gesture for Obtuse angles

Obtuse x > 90 degrees

## Step 4: Acute Angle Hand Gesture

Here is the hand gesture for Abtuse angles

Acute Angle x < 90 degrees

## Step 5: Straight Angle Hand Gesture

Here is the hand gesture for Straight angles

Straight Angle (line) 180 degrees

## Step 6: Right Angle Hand Gesture

Here is the hand gesture for Right angles

Right Angle 90 degrees

## Step 7: Rules of Actual Game Play

As stated in a previous step, since the choices of inputs are even (not odd), the distribution of outcomes will be not be evenly distributed. This can be overlooked since the ultimate goal is for students to learn to distinguish concepts as opposed to being the winner of the game.

The distribution of outcomes are as follows

1) Obtuse Angles beat Acute Angles
2) Acute Angles beat Right and Straight Angles
3) Right Angles beat Obtuse Angles
4) Straight Angles beat Obtuse and Right Angles.

Here are pictures for my reasoning. Yes, my mind works like a child!