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moongazer
 3 years ago
Why is it the sine of an angle is also equal to the sine of 180 minus that angle ?
e.g. sin 45degrees = sin 135degrees
moongazer
 3 years ago
Why is it the sine of an angle is also equal to the sine of 180 minus that angle ? e.g. sin 45degrees = sin 135degrees

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qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2Because the elevation of the inscribed triangle (to the unit circle) is still positive.

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2dw:1348381225832:dw

moongazer
 3 years ago
Best ResponseYou've already chosen the best response.0but why "180  angle", not "angle  180"

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2Well, in the given example. If angle = 45, then 45  180 = 90. sin(90) is not equal to sin(45)

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2Sorry, the calculation was wrong there. 45  180 = 135. But the same applies, sin(135) is not equal to sin (45)

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2It would have the same *magnitude* but not the same *sign*.

moongazer
 3 years ago
Best ResponseYou've already chosen the best response.0I already understand that the value of sine in Q1 is also equal to the sine in Q2. but where did you get the 180 angle like how did you get the lwh for volume

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2Well, volume doesn't come into question here. But it's a simple matter of the definition of the "sine" function. 180  45 = 135, and when you have 45 and 135....the inscribed triangle's elevation is equal in both magnitude and sign.

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2If you go the other direction, you get opposed angles (pointing opposite directions). So you'll get an elevation equal in magnitude but NOT equal in sign.

moongazer
 3 years ago
Best ResponseYou've already chosen the best response.0so "sin(180angle)" is equal to "angle" because "180angle" always give an angle that is equal to the sine of the "angle". is it like that ?

qpHalcy0n
 3 years ago
Best ResponseYou've already chosen the best response.2Well, because the way sine is DEFINED. Remember SOHCAHTOA. Sin = Opp/Hyp Hypotenuse is always positive. So you're looking at the opposite leg of a triangle. The elevations must both have the same sign, if they do not...then the sine's will not match.
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