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Lecture Comments (3)

2 answers

Last reply by: Professor Selhorst-Jones
Mon Sep 30, 2013 10:25 PM

Post by Angela Patrick on September 29, 2013

[Edit by Professor: The mistake has been fixed, the current video is now correct.]

I believe the answer in the "Sum of angles in a triangle" example is incorrect.

the line after "thus," is correct but is then simplified incorrectly

the line after it should read 460-a-b=180

the answer should then be 280

Math Concept Petting Zoo: Part 2

  • If you want to do well on the Math section of the SAT, you need to be familiar with a wide variety of concepts. This is the second of two lessons covering the vast majority of the concepts on the SAT.
  • In this, the second lesson, we'll focus on geometry, shapes, and a few miscellaneous topics. The first lesson generally covered topics relating to the interaction of numbers, equations, and functions.
  • In the Zoo, each concept will be presented by showing a question based on the concept. While there will be some explanation of the questions, the point of the Zoo is to quickly review concepts, not teach them.
  • As you watch this lesson, make sure you have a pencil and paper. Make sure you could solve each problem on your own before the answer is revealed. If you're not absolutely certain you could, pause the video and try to work it out yourself before you continue watching.
  • Whenever you find a concept you don't know well, write it down and note how much help you need.
  • Later, after you've finished watching the lesson, go study the concepts you wrote down. Begin with the ones you find most difficult. Watch the corresponding SAT Math-specific lessons, and if you still need more help, browse Educator.com, search the web, or talk to someone who is good at math.
  • Here's a list of all the concepts in this half of the Zoo:
    • Equation of a Line,
    • Perpendicular Slope,
    • Properties of Angles,
    • Parallel Lines,
    • Ratios,
    • Similar Shapes,
    • Direct Variation / Direct Proportion,
    • Inverse Variation / Inverse Proportion,
    • Pythagorean Theorem,
    • Special Triangles,
    • Sum of Angles in a Triangle,
    • Area and Perimeter for a Polygon,
    • Area and Circumference for a Circle,
    • Volume and Surface Area,
    • Probability,
    • Interpreting Data.

Math Concept Petting Zoo: Part 2

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
  • Legal Disclaimer 0:06
  • Return to the Zoo 0:15
  • Equation of a Line 1:55
    • Example Explanation
  • Perpendicular Slope 3:40
    • Example Explanation
  • Properties of Angles 4:34
    • Example Explanation
  • Parallel Lines 6:05
    • Example Explanation
  • Ratios 7:00
    • Example Explanation
  • Similar Shapes 8:21
    • Example Explanation
  • Direct Variation / Direct Proportion 9:53
    • Example Explanation
  • Inverse Variation / Inverse Proportion 11:25
    • Example Explanation
  • Pythagorean Theorem 13:00
    • Example Explanation
  • Special Triangles 14:27
    • Example Explanation
  • Sum of Angles in a Triangle 16:47
    • Example Explanation
  • Area and Perimeter for a Polygon 18:00
    • Example Explanation
  • Area and Circumference for a Circle 19:38
    • Example Explanation
  • Volume and Surface Area 20:46
    • Example Explanation
  • Probability 24:15
    • Example Explanation
  • Interpreting Data 26:11
    • Example Explanation