> Trigonometry is study of right triangle
to remember you can use:
SOH is defined by sine equals opposite over hypotenuse
CAH is defined by cosine equals adjacent over hypotenuse
TOA is defined by tangent equals opposite over adjacent
Trigonometry function is only needed to know the values of side to find measure of an angle, figure out figure of all part of triangle.
Riza can understand may explanation very fast, and I give her a problem like this :
There is a right-triangle, with the length of opposite is 3, the length of adjacent is 4, and the length of hypotenuse is 5. And there is angle-x in front of the right-angle, and there is angle-m above the right-angle. What is the value of sinus of x, cosines of x, and tangent of x?
Riza can answer it correctly, although sometimes she is wrong to use the function of basic trigonometry, this is her correct answers :
SOH is defined by “Sinus is Opposite over Hypotenuse”, CAH is defined by “Cosine is Adjacent over Hypotenuse”, and TOA is defined by “Tangent is Opposite over Adjacent”.
So we get,
Sin x = Opp/Hyp = 4/5
Cos x = Adj/Hyp = 3/5
Tan x = Opp/Adj = 4/3
second, I explain about table trigonometry, there is:
sin 0=0, sin30=half, sin 45=half square root of two, sin 60=half square root of three and sin 90=1
cos 0=1, cos30=half square root of three, sin 45=half square root of two, cos 60=half and cos 90=0
for this table, riza has any problem to remember the table, I teach riza to remember faster by using our fingers. To sinus table, we start from thumb finger to little finger, there are sin 0=0, sin30=half, sin 45=half square root of two, sin 60=half square root of three and sin 90=1
To cosine table, we start from little finger to thumb finger.
for conclusion my problem to explain math to Riza aritara are: its very difficult to remember the table, second the function trigonometry has difficult to remember.
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