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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.”
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.
By holding hands and making a circle, these children are demonstrating circumference.
Let’s practice,… C=πd C=3.14x8 C=25.12 So, the circle’s circumference is 25.12cm. (diameter) (8 centimeters)
Now you try,… A circle has a diameter of 10 centimeters. What is the circumference? C=πd
C=3.14x10 C=31.40 So, the circle’s circumference is 31.40cm.
Pi is pretty cool, but you can do more than just find the circumference.
Let’s practice,… A=πr 2 A=3.14x6 2 A=3.14x6x6 A=113.04cm 2 So, the area of the circle is cm 2. 6 cm radius
Now you try,… A circle has a radius of 4 centimeters. What is the area of the circle? A=πr 2
A=3.14x4 2 A=3.14x4x4 A=50.24cm 2 So, the area of the circle is 50.24cm 2.
Find the circumference of the following circles: (Write the formula that you will use.)
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