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For more information, please see full course syllabus of SAT: Mathematics
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Lecture Comments (5)

1 answer

Last reply by: S k
Fri Jan 20, 2017 1:43 PM

Post by Abazar Naqvi on August 22, 2015

how did you know that the angle was 90 degree?

2 answers

Last reply by: John Stedge
Tue Aug 1, 2017 10:38 AM

Post by Kavita Agrawal on March 11, 2013

In the second Learn by Example Problem,I think the answer should be 43 degrees, not 47 degrees. From the information provided in the problem, you can't assume that lines CD and AB are perpendicular and form right angles. If you look closely at the diagram, you can see that angle DBA and ACD intercept the same arc. This makes both these angles congruent, so angle DBA, which we know to equal 43 degrees, is congruent to angle ACD. Angle ACD is congruent to angle CDB, since all alternate interior angles formed by a transversal and 2 parallel lines are congruent. This means that x = 43 degrees, as x is equal to angle CDB. Did I overlook something, or is the answer given in the slide incorrect?

Angles on the SAT

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
  • How Angles are Tested on the SAT 0:11
  • What You Need to Know About Angles 1:13
  • Lean by Example: Angles (1) 2:48
  • Lean by Example: Angles (2) 5:45