trigonometry
Video-Coterminal Angles
14 Nov 09
Unit Circle - Video
11 Nov 09
The Unit Circle
Using the reference angle to determine the coordinates of different quadrants.
Unit Circle Vid
Math 30
Using the reference angle to determine the coordinates of different quadrants.
Unit Circle Vid
Math 30
Initial Projectile Velocities
07 Oct 09
Converting Velocities into its X and Y Components
Whenever a vector is given at angles other than 0o, 90o, 180o, 270o, or 360o, the vector just be broken into its X and Y components.
For the example above, the velocity of the projectile is 45 m/s at 30o to the horizon.
By using trig functions, we get the following setup:
Vx
cos 30o = Vx/45
Vx = 45cos(30o)
Vx = 38.9 m/s
Vy
sin 30o = Vy/45
Vy = 45 sin(30o)
Vy = 22.5 m/s
Whenever a question gives vectors at an angle, remember to convert the initial vector into its X and Y components by using trigonometric functions.
Whenever a vector is given at angles other than 0o, 90o, 180o, 270o, or 360o, the vector just be broken into its X and Y components.
For the example above, the velocity of the projectile is 45 m/s at 30o to the horizon.
By using trig functions, we get the following setup:
Vx
cos 30o = Vx/45
Vx = 45cos(30o)
Vx = 38.9 m/s
Vy
sin 30o = Vy/45
Vy = 45 sin(30o)
Vy = 22.5 m/s
Whenever a question gives vectors at an angle, remember to convert the initial vector into its X and Y components by using trigonometric functions.
Trig Function Review
16 Sep 09
Here’s a quick review of trigonometric functions.
On the following diagram:
A=angle
opp=oppsite side to A
adj=adjacent side to A
hyp=hypothenuse
sin(A) = (opp)/(hyp)
cos(A) = (adj)/(hyp)
tan(A) = (opp)/(adj)
On the following diagram:
A=angle
opp=oppsite side to A
adj=adjacent side to A
hyp=hypothenuse
sin(A) = (opp)/(hyp)
cos(A) = (adj)/(hyp)
tan(A) = (opp)/(adj)