VIEWS: 15 PAGES: 12 POSTED ON: 8/3/2012
Circumference Wilfredo Rodriguez Multimedia Project #4 Circumference What is a circle? • A circle is defined as a set of points equidistant from a given point. Circumference What is a radius? • The radius of a circle is a segment that has an endpoint on the center and another on an endpoint on the circle. Circumference What is the diameter? • A diameter is a straight line through the center and terminating in both directions on the circumference. Circumference What is the circumference? • The circumference of a circle is the distance around the circle. You can think of it as the perimeter of a circle (periphery). Circumference The circumference of a circle Circumference How do we find the circumference? • For all circles of all sizes the formula C 2r......, r,...... d o C • C = circumference, d = diameter, and r = radius. Circumference First we need to find (pi)! What is ? Is it….. 3.14159265358979323846264338 327950288419716939937510582097 494459230781640628620899862803 482534211706798214808651328230 66470938446095505822172535…..? Circumference How do we find π? • π is found through the ratio of the circumference and the diameter. π is always approximately 3.14. C C 3.14,...or......, d d Circumference The number of times you must travel along the diameter of the circle to go the same distance as all the way round the circle is known as Pi. once twice three times across and a little bit more! Since is a bit more than 3. Circumference Summary Circumference = × Diameter Circumference Student Activities • GeoGebra Demonstration • Student Activity 1 • Student Activity 2 • Student Activity 3 • Student Activity 4 • Archimedes Circumference
"Circumference - GeoGebra"