Define circle and identify the measurements radius, diameter, and circumference.
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The following materials are needed for this lesson: compasses, rulers, and blank paper.
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Draw a circle in two ways:
Method 1:
Method 2:
Based on your drawings, how would you define a circle?
A circle is shown below with center point $$A$$, and points $$B$$, $$C$$, and $$D$$ on the circle.
Hilary is ordering a large circular pizza from her local pizza shop. She asks about the size of the pizza and is given 3 different values: 14 inches, 44 inches, and 7 inches.
Hilary knows three measurements that are used to describe circles: radius, diameter, and circumference. Which value best matches each measurement? Explain your reasoning.
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The following resources include problems and activities aligned to the objective of the lesson that can be used to create your own problem set.
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The circle below has a center at point $$A$$ and a radius of 4.5 cm.
Which of the line segments below can you determine the measurement of? Find the measurement of the line segments that you can determine. For any one you cannot determine, explain your reasoning why.
a. $$\over AB$$
b. $$\over AC$$
c. $${\over DF}$$
d. $$\over AE$$
e. $${\over DE}$$
f. $$\over AD$$
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