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Probability in Geometry: Solving Probability Problems and Calculating Probability

Learn how to solve probability problems in geometry and calculate probability. Discover where probability is used and how to determine possibilities and winners. Suitable for students, doctors, secretaries, accountants, and programmers.

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Probability in Geometry: Solving Probability Problems and Calculating Probability

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  1. Warm Up Write the converse, inverse, and contrapositive of: “If M is the midpoint of AB, then M, A, and B are collinear. Are these statements true or false?

  2. False • Converse: If M, A, and B are collinear, then M is the midpoint of AB • Inverse: If M is not the midpoint of AB, then M, A, and B are noncollinear. • Contrapositive: If M, A, and B are noncollinear, then M is not the midpoint of AB. False True

  3. Probability How to solve probability.

  4. Where do we use probability? Insurance companies, card players, casino, lottery etc… Who uses probability? Doctors, secretaries, accountants, programmers, and GEOMETRY STUDENTS! Just to name a few. Setting up and solving probability problems requires precise and orderly organized thinking skills.

  5. Probability is not part of geometry but statistics. However, you will see problems in the “Problems Sets” that deal with it, so follow these Two Basic Steps. 1. Determine all possibilities in a logical manner. Count them. 2. Determine the number of these possibilities that are “favorable”. We shall call these winners.

  6. Calculate Probability: Probability= number of winners number of possibilities A Ex. 1a. If one point is picked at random from the given figure, what is the probability that it is on the angle? B C D List all possibilities: circle the winners. A, B, C, D P= = 1 100% it will happen!

  7. Ex. 1b. If two are picked at random, what is the probability they lie on ray CA? A B Order possibilities! AB BC CD AC BD AD C D Remember AB is the same as BA Circle winners. P = = or 1:2 or 50%

  8. Ex. 2 What is the probability of picking Point Q on AC and it be within 5 units of B? A B C -20 7 10 Find the probability by comparing the length of the “winning” region

  9. Total numbers between -20 and 10 = 30 Within 5 units of B = 8 P = winners possibilities = =

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