Parts of a Circle
Click here to print out the chart and record your findings. Find a plate to use as the first object and measure to find the circumference (C) and diameter (d). Divide to find C ÷ d. Use a ruler to measure the diameter in centimeters to the nearest tenth of a centimeter (eg. 5.1 cm). Use a string or yarn to wrap around the circle, then extend it out in a straight line and measure the length in centimeters to the nearest tenth. When you do this you are measuring the object’s circumference (distance around the circle). Use a string that doesn’t stretch easily for better results. You may use a calculator to divide. Find two more circular objects to measure and calculate circumference divided by diameter. Use the chart to answer questions #1 through #3.
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| 1) State the answers.
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| 2) State the answers.
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| 3) State the answers.
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| 4) State the answer.
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| 5) State the answer.
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Circumference of a Circle
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| 10) Study the explanation and development of the area formula provided in the link on the overview page. Would the formula change if the circle was divided into 100 pieces instead of 12? Explain why or why not.
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For problems #11 through #13, find the area for circles with the given dimensions. Be sure to label the answer correctly.
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Area of Circle Sectors
Use the orange circle to compute the areas for problems 14 – 17. Round to nearest hundredth when necessary.
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| 20) State the letter of the answer and the answer to each of the items given.
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| 21) A rectangle is a parallelogram. What special characteristic does a rectangle have that not all parallelograms have?
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| 23) Make the following customary units conversions. State the letter and then the answer.
a. 3 pt = ____ c
b. 7 qt = ____ pt
c. 8 min = ____ sec
d. 96 hr = ____ da
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| 24) Make the following metric units conversions. State the letter and then the answer.
a. 7.2 cm = ____ mm
b. 5400 g = ____ kg
c. 6 L = ____ mL
d. 78,000 m = ____ km
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| 25) Fill in the blank with the type of geometric figure that is illustrated. Choose from the terms given. State the letter and then the answer.
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| 26) If you were directed by your school to complete Offline Activities for this course, please enter the information on the Log Entry form. |
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