Circles Gone Wild!By Carley, Katy, and Lexi

Two Dimensional Circles • A circle is a closed plane figure with all of its

points the same distance from the center point• A diameter is a line segment passes through the

center point of the circle with both endpoints on the circle

• A radius is a line segment with one endpoint on the circle and the other endpoint on the center point

• The formula to find the area of a circle is π × radius²

• The formula for circumference of a circle is π × diameter

Three Dimensional Circles

• A sphere is a three dimension circle

• The circumference goes around the center of a sphere

• The formula to find the volume of a sphere is 4π³/3

• The formula to find the surface area is 4πr³

Geometric Definitions • Chord - The line that goes from one side to

another a diameter is also a chord• Arc – A portion of a circle• Pie Graph – A graph that is shaped like a circle

that is split into parts showing a percent of something

• Semi Circle – An arc that is half of a circle

Pi•Pi is rounded to 3.14 or 22/7•Pi is used to find the area and

circumference of a circle•Pi lasts forever with infinite

digits

More Shapes

•A cylinder has bases that are circles

•A cone has one base that is a circle

•These are both three dimensional figures

Comprehension ???s• How do you find the volume of a

cylinder?• What is diameter?• What is Pi as a fraction?• Is diameter considered a chord?• If the Earth cracked in half, would it

be a semi circle?

Work Cited•http://animatonlibrary.com/

•http://www.yahoo.com/•http://www.google.com/

Credits:

Katy Burns

Carley Burns

Alexis Velasquez Thank You!