You are not logged in.
Post a reply
Topic review (newest first)
Here, maybe this can help you. Remember the 30 60 90 degree triangle. These can be used to find the sines, cosines and tangents of 30, 60, 120, 150, 210, 240, 300, and 330. Look at the diagram. Just remember that the large angle that isn't the 90 degree angle, is the 60 degree angle, and the short one is the 30 degree angle. Using this diagram, you can easily find where the angles stand at. For instance, in the left diagram, the angle at the top left (the one pointing up and to the right) is 60 degree's before the 180 degree line, therefore its angle is 180 - 60 or 120. The sine = opposite over hypotenuse, or vertical height over hypotenuse. So the sine of 120 = sqrt (3) / 2.
ok theres the frequently discussed 30, 60, 90 degree triangle. You remember that. This shows us that the sine of 30 = 1/2. Also the sine of 150 = 1/2, and of course, you can always add increments of 360 to get the same sine.
help me please...this is urgent guys...huhuhu
I am stuck with this one...can anyone please show me how to do this step by step please...