Activity on circumference of circle
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If your class is learning about geometry or circles, it's important for students to know how to calculate the circumference of a circle. Use these activities to help students understand and identify circumference.
Around and Around We Go
Have you ever wondered how far you travel when you go on a merry-go-round ride? Thanks to the measurement of circumference, it's completely possible. When students understand how to calculate circumference, it allows them to measure distances other than in a straight line. Let's look at activities to help students understand and calculate the circumference of a circle.
Measure and Check
Have students measure the circumference of a circle using two different methods.
Materials
Hula hoop
String
Rulers
Paper
Pencil
Drawings of circles (various sizes)
Teacher Directions
Prior to the activity, draw circles of different sizes on papers.
Show students how to find the circumference of a circle using the formula C (circumference) = ? (pi) x d (diameter). Demonstrate how to measure the diameter of the hula hoop using the string to measure from one point on the hoop, through the center, to another point on the hoop.
Divide the class into pairs, and provide each group with string, rulers, paper, pencils and various drawings of circles.
Have students measure the circumference of each circle by laying the string around the circle and measuring it. Then, measure the circumference of each circle by measuring its diameter with a ruler and substituting it into the circumference formula.
Encourage the class to compare the results of both measurements for each circle.
Answer:
Materials
Hula hoop
String
Rulers
Paper
Pencil
Drawings of circles (various sizes)
Teacher Directions
Prior to the activity, draw circles of different sizes on papers.
Define circumference for the class. Show the class a hula hoop, demonstrating how to find the distance around the circle by laying string all the way around the hoop and then measuring the distance of the string.
Show students how to find the circumference of a circle using the formula C (circumference) = ? (pi) x d (diameter). Demonstrate how to measure the diameter of the hula hoop using the string to measure from one point on the hoop, through the center, to another point on the hoop.
Divide the class into pairs, and provide each group with string, rulers, paper, pencils and various drawings of circles.
Have students measure the circumference of each circle by laying the string around the circle and measuring it. Then, measure the circumference of each circle by measuring its diameter with a ruler and substituting it into the circumference formula.
Encourage the class to compare the results of both measurements for each circle.
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