Trigonometry Flashcards
How do you convert degrees to radians?
(Pi)/180
How do you convert radians to degrees?
180/(pi)
180 degrees =?
Pi
1 rad =?
180/(pi)
1 degree =?
(Pi)/180
How do you find coterminal angles?
- ) find an angle between desired values.
2. ) either add or subtract. (Finding negative coterminals)
How do you find length of an arc?
S=theta(radius)
How do you find the central angle of theta?
Theta= s/r
How do you find area of a sector?
A=1/2r^2theta
How do you find points moving from linear speed to circular speed?
Angular speed= w= theta/time
Linear speed= v=s/t
Sin theta =?
Opposite/hypotenuse
Cos theta=
Adjacent/hypotenuse
Tan theta =
Opposite/adjacent
Sin 30=?
1/2
Cos 30=?
Sq. rt. 3 over 2
Tan 30 =?
Sq. rt. 3 over 3
Sin 45 =?
Sq rt 2/2 (likewise for cos)
Tan 45=
1
Sin 60=?
Sq rt 3 over 2
Cos 60=
1/2
Tan 60=?
Sq rt 3
Sin theta=
y/r
Cos theta=
x/r
Tab theta=
x/y