by Ryan O’Donnell

8th Grade Math

Measuring and Identifying Angles

Ryan O’Donnell
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TITLE: Pool Angles

SUBJECT: 8th Grade Math

TOPIC: Measuring and Identifying Angles

INTERACTIVITY: The student is given a set scenario of where their pool balls are placed on the table and must use the given string and protractor to measure the angle formed by the cue ball, designated color ball, and intended pocket. The student will follow the steps given to measure all other angles and, when completed, record their results on their worksheet.

DIRECTIONS FOR USE: Make sure the pool table is arranged according to the diagram given. If not attached already, the cue ball should have a push-pin through a knot in the given string that is placed in the middle of the cue ball. Your first shot is the 5-ball in the top-right corner pocket. Now, place the string on top of the designated ball, use a push-pin to attach the string to the middle of the ball, and, finally, wrap the string around the push-pins adjacent to the intended pocket. Use the pushpin on the designated ball to hold the given protractor in the marked center of the designated ball. Make sure you push the pin through the hole in the middle of the bottom of the protractor (right above the 3-inch mark). Measure the angle that the cue ball, designated colored ball, and intended pocket form, then record the information on your worksheet.

After recording your measurement, re-pin the cue ball where it would land based off of the “Important Information” above. Also, you should re-pin the designated colored ball to its intended pocket. Your second shot is the 6-ball in the left side pocket. Follow the previous steps given to measure and record the constructed angle. Your third shot is the 7-ball in the bottom-right corner pocket. Follow the given steps to measure and record the angle constructed. Your final shot is the 8-ball in the top-left corner pocket. Again, follow the steps, then measure and record the constructed angle on your worksheet.

TIME: 20 minutes

SPECIAL CONSTRUCTION: The pool balls on the table had to be specifically constructed to form straight or obtuse angles. I also used a string and a protractor, so the students would be able to measure the angle formed by the balls and pocket before they record it on their worksheet.

CREDIT: Since this activity is not very time-demanding, this activity would be required and worth approximately 20 (non-extra credit) points.

Ryan O'Donnell
Spring 2007