Circles
1) Radius, circumference and diameter: http://www.studyzone.org/mtestprep/math8/e/diamradcircle6l.cfm
2) Parts of a circle: http://www.mathsisfun.com/geometry/circle.html
3) Arc of a circle: http://www.mathwords.com/a/arc_circle.htm
4) Mrs. Cwetna explaining a few problems from a quiz about finding the radius when given the sector length and/or area and theta (EDUCREATIONS): http://www.educreations.com/lesson/view/sector-area-mwf-quiz-4-9/12158296/?ref=link
5) Area of a Sector/Segment (w/practice) : http://www.mathsisfun.com/geometry/circle-sector-segment.html
6) Area of a sector (interactive demonstration): http://www.mathopenref.com/arcsectorarea.html
7) Radians: http://www.mathsisfun.com/geometry/radians.html
8) Sectors, Areas, and Arcs: http://www.purplemath.com/modules/sectors.htm
9) Area of a Sector (video): http://www.virtualnerd.com/pre-algebra/perimeter-area-volume/circles/circle-sector-area-examples/sector-area-formula
10) Lines and line segments of a circle, graphic organizer
2) Parts of a circle: http://www.mathsisfun.com/geometry/circle.html
3) Arc of a circle: http://www.mathwords.com/a/arc_circle.htm
4) Mrs. Cwetna explaining a few problems from a quiz about finding the radius when given the sector length and/or area and theta (EDUCREATIONS): http://www.educreations.com/lesson/view/sector-area-mwf-quiz-4-9/12158296/?ref=link
5) Area of a Sector/Segment (w/practice) : http://www.mathsisfun.com/geometry/circle-sector-segment.html
6) Area of a sector (interactive demonstration): http://www.mathopenref.com/arcsectorarea.html
7) Radians: http://www.mathsisfun.com/geometry/radians.html
8) Sectors, Areas, and Arcs: http://www.purplemath.com/modules/sectors.htm
9) Area of a Sector (video): http://www.virtualnerd.com/pre-algebra/perimeter-area-volume/circles/circle-sector-area-examples/sector-area-formula
10) Lines and line segments of a circle, graphic organizer
Chords, Secants, and Tangents
![Picture](/uploads/1/6/6/0/16603678/410148199.gif)
1) Rules for dealing with chords, secants, & tangents in circles: http://www.regentsprep.org/Regents/math/geometry/GP14/CircleSegments.htm
2) http://www.mathwarehouse.com/geometry/circle/tangents-secants-arcs-angles.php
3) Interactive demonstration: http://www.mathopenref.com/secantsintersecting.html
2) http://www.mathwarehouse.com/geometry/circle/tangents-secants-arcs-angles.php
3) Interactive demonstration: http://www.mathopenref.com/secantsintersecting.html