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7.7 notes Page 2

Added Jan 28, 2015 •

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okay so the first one we're going to do is you can look these up on your trig chart or you can type them in your calculator so remember if you want to find angle hey you move the tangent over here and it makes it to the inverse tan so what that's going to look like is  is going to equal 10 to the negative 1 of Point 4040 type that in your calculator exactly good lunch and angle a is going to equal 21.998 or 22 degrees is what it will round to okay so number to co-sign be so we move the cosine over here to get V by itself and you have cosine of negative one or first cosine of .469 v and plug that in your calculator exactly like it looks and you get point nine nine nine nine nine so angle B is 1 degrees what that's going around to likewise number three sign of you you want to move the sign over here so when you made it across the equal sign it becomes the inverse of sine of .8 to 9 0 type that in your calculator exactly like it look 55.996 so basically angle you is 56° same thing here you tan to the other side so angle a is equal to tan -1 or the inverse tan of 1.7 3 2 1 type in your calculator exactly like it looks angle a is equal to 60 degrees  okay so that's how you're going to do those now we're going to do the same thing when we set up these triangles right here but you're going to have to set up your ratio your opposite over adjacent whatever you have so you have to get the angle that you're given so in this case it's this single so look at what you're giving always identify your hypotenuse first so of course this is your hypotenuse from single that you're given this is your opposite in this is your adjacent so we are given the opposite and the adjacent therefore we're going to want to use change it because that's opposite over adjacent so if we do tan  obtuse angle that's given let's do just name a day for this sake Kohl's the opposite 16 over the adjacent 27 so we want to move the tan over here so we have a equals the inverse tangent So Tan to the negative 1 of 16 / 27 now you can type a turn calculator exactly like that looks and get the answer or you can change the 16/27 to a decimal first in type that in your calculator but if you do it this way just make sure that you put parentheses around the 16 / 27 before you hit enter  chilango a just going to equal 30.65 degrees Pinterest okay so that angle right there is 30.65 degrees now you can find the other one just by simply subtracting 90° fellows go over the numbers next web this single right here so that gives us the opposite and the hypotenuse no opposite over hypotenuse is play know if you can go ahead and Skip to that next step and say will that angle a is going to be the inverse sine of 4 6 / 48 and you just type that in your calculator the inverse sine open parentheses 46 / 48 close parentheses hit enter get 73.4 degrees and your done right here you have the opposite have the adjacent cuz remember this is the hypotenuse so opposite over adjacent is tangent so we want to do the inverse tan we'll meet again is equal to the opposite 15 over the adjacent 21 type in your calculator exactly like it looks 35.5 degrees we want to find this angle right here that is the opposite what is this think about it it's cross from the 90s what's the hypotenuse so we have opposite and hypotenuse opposite and hypotenuse is sign so this angle is going to the inverse sine  the opposite 11 over the hypotenuse 37 typing in your calculator you get 17 3 degrees so basically you can pick you want to do sine cosine or tangent because you have every sign to do either one let's just say I want to do sign on this one so if I'm going to do end of this single that's the opposite over the hypotenuse so sine inverse of 30 over 78 can you type it in your calculator you get 26  I'm sorry you get 22 6 degrees let this time so let's do the opposite over the adjacent so the end Team Angle a equals the inverse tan of opposite 77 / 36 the adjacent type that in your calculator 64.9 degrees okay so that's how you do that it's pretty simple no remember your homework sheet and you should already but if you have any questions come see me

Uploaded by Pam Chastain.

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7.7 notes Page 2

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