17 videos in "Circles"

Circles 1  Circumference and Area

Circles 2  Circumference and Area

Pi Day

Equation of Circle 1

Equation of Circle 2

Equation of Circle 3

Equation of Circle 4

Equation of Circle 5

Equation of Circle 6

Equation of Circle 7

Equation of Circle 8

Equation of Circle 9

Equation of Circle 10

Finding Sector Angle Given Arc Length and Radius

Find Arc Length of Sector

Using Arc Length Formula to Find Circle Values

Circumference and Area of a Circle
Pi Day
Pi Day
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The truth on what Pi Day (March 14) is really about...
 Definition of Pi  A definition of what pi is and some information about pi.
 Diameter of a circle  A description and explanation of what the diameter of a circle is and how to calculate other measurements from the diameter.
 Circumference of a circle  Definition of circumference of a circle, how to find it, and some interesting facts about circumference.
 Area of a circle  The definition of area of a circle as well as explanations of how to find the area of a circle is shown with several formulas.
 Pi Facts  A list of 50 interesting facts about pi  quite an impressive collection.
 Pi Infographic  A banner graphic with some fun facts about pi and its history. A great resource for teachers!
 What is pi day?
 Who first studied pi?
 What is pi?
 Where does pi come from?
 How does pi relate to the circumference and diameter of circles?
 If you have a circle with a diameter of 6in., how do you find its circumference and area?
 What is the formula for circumference of a circle?
 What does C = pi*d or C = 2*pi*r mean?
 What does C = 3.14*d mean?
 What is the formula for area of a circle?
 What does A = pi*r^2 mean?
 What does A = 3.14*r^2 mean?
 How many times longer is the circumference of a circle than its diameter?
In this video, you will learn what Pi Day is all about, what pi means, and how it relates to the circumference and area of a circle. You will also learn the formulas for circumference and area of a circle as well as how many times longer a circle's circumference is than its diameter. You will also have fun watching!