Today Mrs. Saatkamp began by correcting the homework. The problem that most students struggled with was number 26, in which we had to use the quatratic formula to solve the excercise and the answer was 12.(i don't know how to represent this problem on geogebra, sorry) After this, Saatkamp moved on to introduce us to our lesson for the day, Lesson 8-3: "Trigonometry: Ratios in Right Triangles". She changed all of our calculators to work with degrees instead of radians. She also told us to check if our calculators worked by typing the function first and then the number or the other way around. Ex: sin(30) or (30)sin. We must memorize this so we can easily work with the calculator. Saatkamp then moved on to the actual explanation of our lesson. She began by drawing the following diagram on the board:
After the teacher drew this, she went on to explain what sine, cosine, and tangent actually are:
**********A trick to remember all of these formulas is SOH-CAH-TOA: SOH meaning sin= opposite/hypotenuse. CAH meaning cos= adjacent/hypotenuse. TOA meaning tan= opposite/adjacent.**********
Another reminder is to watch out for equal signs. Because of all of the rounding done in this chapter, you might need to use an "approximately" sign.
Later, Mrs. Saatkamp also said that if we needed to isolate the x in any equation with tan, sin or cos, that we needed to use the inverse functions on our calculators: tan^-1, cos^-1 and tan
The HW is page 416/#17-53 all except 50.
Good Luck and have a happy "Carnaval"
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