The MOVE AWAY FROM BASICS
Well, now that the basic of the basics of trigo is covered. Let’s get our hands dirty doing something more ‘interesting’ … ;)
Hence, we will be looking into the TRIGO RATIO & SPECIAL ANGLES…
Ok. Before I start a gentle reminder!! Hehehe… from this section hence forward, there WILL BE A LOT OF MEMORIZATION… that means that theses stuff will not be given as formulas in test and quizzes.. it is up to u to have it IN YOU HEAD!! J
Ok let us begin shall we…
TRIGO RATIOS always come from the SPECIAL TRIANGLE… what are they u ask?? Well look at the triangles below
They are both 90 ̊ (π radian) triangles. Their other sides, however is different. Hence, the other angles are part of the special angles that make up the important special ratios…
Using my ‘knowledge’ of the basic sin,cos and tan in addition to the lengths of the sides of the triangles above..
THIS TABLE IS CRUCIAL… REMEMBER IT!!
Here is a song to remember it by…
Another, important note… FORGET NOT THE “CAST RULE”.
The diagram shows which trigo is positive in which quadrant. The “CAST RULE” is important when using related angles with the special angles and finding their ratios. If u still find it kinda confusing, this website may be of great help… J
CHECK IT OUT>>>
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