social studies exploratory math / lunch / math locker time english science mar. 27 thursday, day d
TRANSCRIPT
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Social StudiesExploratoryExploratory
Math / LUNCH / MathLocker Time
EnglishScience
Mar. 27Thursday, Day D
Mar. 27Thursday, Day D
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(1) Take out your H.W.
(2) Copy and solve for x in notebook:
Activator:
2.3x =16.1
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Calculate the ratio of circumference to diameter.
Discover the formula for the circumference of a circle and use it in solving circle problems.
Objective(s)
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around across÷ = some #
around across = some #
circumference diameter 3.14
3.14circumference
diameter
or
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÷ =
=
circumference diameter 3.14
3.14circumference
diameter
C
C
d
d
or
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Which leads to the following formula for circumference…..
how?
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Note:
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Why did we use the ratio of circumference to diameter for several objects? Wouldn’t we have gotten the same result using just one object?
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Why did we use the ratio of circumference to diameter for several objects? Wouldn’t we have gotten the same result using just one object?
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Were any of the ratios in the last column not close to 3.14? If not, explain what might have happened.
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Describe some situations in which knowing the circumference (and how to calculate it) would be useful.
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Bike tires are often described by their diameter.
For instance, a 26-inch tire is a tire such that the diameter is 26". Each time the tire makes one complete rotation, the bike moves forward a distance equal to the circumference of the tire.
Therefore, it would be helpful to know how to calculate the circumference based on the diameter.