Math 120:
Pre-calculus 2
Instructor: Mike Panitz
(mpanitz@cascadia.ctc.edu)
Today
• Law of Sines
– (8.2 / 4e (10.2 / 3e))
• Law of Cosines
– (8.3 / 4e (10.3 / 3e))
• Go over Exam #2
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Next Lecture
• Area of Triangle
– (8.4 / 4e (10.4 / 3e))
• Polar Coordinates
– (9.1 / 4e (11.1 / 3e))
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Homework
• All homeworks will be collected on the last day
class (Mar 16th)
– Collected at the beginning of class
• If you don’t have it @ the start of the exam, you
can hand it in later that day, to room 154.
– If you don’t hand it (all) in that day, you will get a zero
for any missing homework assignments.
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End-Of-Lecture Slides
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Exam #2
• Overall, pretty good (Mean = 80%)
• Problem areas:
– Inverse Trig Functions
– 4 cos2   2 3  0
2
2
sin


cos
  cos   0
–
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Study Quiz
• Almost the same deal as last time:
–
–
–
–
Quiz will be on one of the three ‘problem areas’
Will be 1, maybe 2 questions
Will be added onto the Exam #2 grade
Total grade for Exam #2 can’t go past 100
• Will happen next Thursday, at the end of
class
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Grade Summary
• 2 objectives:
– Let you know how you’re doing
– Let me know if there are any errors
• If you find an error, show me the paper that proves
something needs to be changed (i.e., the exam, etc)
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HW Correction
• HW block #1 “correction”
– We were short 8 points for that first block
• Should have had 32, actually had 24
– I added to each student’s grade
(8 points) * (the % of HW block #1 that you got)
• Example:
– If you got 21 / 24 on the homework, you got a
correction (addition) that was 8 * (21/24) = 7 points
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