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Students will use a protractor to investigate different types of angle: acute, obtuse and straight.
Why is a circle divided up into 360 degrees? The degree is derived from the Babylonian base 60 numerical system. Hours and minutes are also divided into 60’s.
Mathematicians were going to use the number 365 (corresponding to the number of days in a year), but since everyone has at least 5 bad days in a year, they threw them out!
360 degrees was also used because it is easily divisible by many numbers. Students should understand the following vocabulary for this activity: right angle, obtuse angle straight angle, and acute angle.
2. Become mathematical problem solvers.
Invitation to Learn
Ask the students if they have ever heard anyone say, That car just spun a 360! Or, I can do a 180 on my skateboard. Ask them to share what they think this means.
acutea positive angle whose measure is less than 90 degrees
obtusean angle whose measure is greater than 90 degrees
straightan angle whose measure is 180 degrees
rightan angle whose measure is exactly 90 degrees.
Math/Science; HealthIncrease the speed of Angle Aerobics, then talk about aerobic fitness. Have them measure resting heart rate before they exercise and then their heart rate afterwards.
ScienceHave students find angles in nature, and record them. What type of objects occur naturally with angles? (spider webs, tree branches etc.)
For physically challenged students, have them point to the direction being spoken instead of moving their bodies.
If you can do this activity outside, you can add action words like, “jump around 180 degrees,” and “spin around 360 degrees.”
Homework & Family Connections
Have students play angle aerobics at home. Have students find four objects in their home that have acute, obtuse, straight, and right angles. Have them write them down so that they can share them with the class the next day.
While students are playing angle aerobics, evaluate them visually using the following rubric;
1. The student can move right or left, but confuses the angles.
2. The student can move 90 degrees, 180 degrees, and 360 degrees, but confuses them.
3. The student can move 90 degrees, 180 degrees, and 360 degrees, without mistake.
4. The student can move 90 degrees, 180 degrees, and 360 degrees, and can verbalize what they have learned either in a journal or orally.