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It looks like this,…

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Not like this,…

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Pi Day is celebrated on March 14th (3/14) around the world. Pi is the word for the Greek letter “π.”

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Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational number, it will continue infinitely without repetition or pattern.

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By holding hands and making a circle, these children are demonstrating circumference.

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Let’s practice,… C=πd C=3.14x8 C=25.12 So, the circle’s circumference is 25.12cm. (diameter) (8 centimeters)

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Now you try,… A circle has a diameter of 10 centimeters. What is the circumference? C=πd

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C=3.14x10 C=31.40 So, the circle’s circumference is 31.40cm.

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Pi is pretty cool, but you can do more than just find the circumference.

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Let’s practice,… A=πr 2 A=3.14x6 2 A=3.14x6x6 A=113.04cm 2 So, the area of the circle is 113.04cm 2. 6 cm radius

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Now you try,… A circle has a radius of 4 centimeters. What is the area of the circle? A=πr 2

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A=3.14x4 2 A=3.14x4x4 A=50.24cm 2 So, the area of the circle is 50.24cm 2.

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11.4 Circumference and Arc Length

11.4 Circumference and Arc Length

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