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For more information, please see full course syllabus of GRE/ACT/PSAT Math
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Lecture Comments (2)

1 answer

Last reply by: Junyu Zhu
Mon Dec 30, 2013 12:02 AM

Post by Cherise Ocen on May 11, 2013

where did you get the 18 in a=18pie from? wouldn't the radius be 6 ?


Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • The Basics: Parts of the Circle 0:11
    • The Diameter
    • The Radius
  • Arcs and Sectors 3:41
    • Arc
    • Sector
    • Using Fractional Weights
  • Tangent and Concentric 8:39
    • Lines that are Tangent to Circles
    • Tangent Circles
    • Concentric Circles
  • Angles in a Circle 11:55
    • Half Circles and Quarter Circles
    • Proportional Areas and Circumferences for Circle Parts
  • Inscribed angles 14:37