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# Trigonometry

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by

## Mary Dunn

on 25 October 2013

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#### Transcript of Trigonometry

Trigonometry
prezi by Mary & Ty
Ms. Corbett
class period 3
What is Trigonometry?
-the study of triangles by using functions to study properties of triangles
the main formula
How did we use this formula as a carpenter?
To fix a wobbling door we had to insert a wire support. We know that the width of the door was 3 feet and 8 feet high. The wire was going to be placed diagonally, so we used the Pythagorean theorem. You need to add 3 squared + 8 squared = c squared. So, 9+64 =c squared. 73 = c squared then the square root of 73 is 8.5 feet. What did you get?
In problem two, there was a house that a carpenter was cutting boards for. At the top of the house where the sides meet it forms a 90 degrees angle. The width of the house is 8 yards. It is common sense that the corners where the roof meets the house was 45 degrees each. Which means that a=b. We did the inverse of the Pythagorean theorem by putting 8 squared in the c squared spot. The carpenter needs to cut his boards to = 5.6 yards. What did you get?
trig ratios
there are three ratios
•tangent
•cosine
•sine
Lets get our tan on!
tanA opposite leg over the adjacent leg
How did we use the ratio?
In problem three there was a handicap ramp you had to build. 3 feet high and when the ramp touches the ground it needs to be at a 7 degree angle. First set up the ratio which is tan7 degrees = 3/x. Tan 7 degree times x =3. x=3/tan 7 degree. x=24.4 So, the length of the ramp will need to be 24.4 feet. What do you think?
sine or cosine
Cos A~the adjacent leg over the hypotenuse
How did we use the formula?
To find the other length of the wall in problem four we used the cosine ratio. To find the length of the vertical line you need to set your problem up cos63 degrees = y/10. 10x cos63 = y. Y=4.5ft. So, the length of the adjacent side is 4.5 feet
It's not a sin
sin A=opposite leg over the hypotenuse
How did we use the formula?
In problem four you have to put molding in a triangular room without using a tape measure. One corner was 90 degrees and the hypotenuse was 10 feet tall and one corner was 63 degrees. We used the sine ratio to determine that the length opposite the hypotenuse is 8.9 feet. What do you think?

References
http://www.solarius.com/dvp/gallery/wdw_spaceship_earth_4.html
http://ronblond.com/MathGlossary/Division03/Pythagorean%20Theorem/index.html
http://neaportal.k12.ar.us/index.php/2011/05/find-the-measures-of-angles-of-right-triangles-using-sine-cosine-and-tangent-en-espanol/