Classify the following angles as one of the following:
Acute
Obtuse
Right-angled
Straight
Reflex
Revolution
Evaluate the following, correct to two decimal places:
\cos 126 \degree
\sin 146 \degree
Write the following trigonometric ratios using an acute angle:
\sin 147 \degree
\cos 165 \degree
\sin 125 \degree
\cos 160 \degree
\sin 91 \degree
\cos 120 \degree
In the following graphs, angle a is in standard position with its terminal side intersecting the circle at the given point P :
Find \sin a.
Find \cos a.
P \left(\dfrac{7}{25}, \dfrac{24}{25}\right)
P \left( - \dfrac{24}{25} , \dfrac{7}{25}\right)
P\left( - 0.8824 , 0.4706\right)
Consider the unit semi-circle shown below:
Evaluate:
\sin 60 \degree
\cos 60 \degree
State the coordinates of point B.
Hence, evaluate:
\sin 120 \degree
\cos 120 \degree
Consider the unit semi-circle shown below:
Evaluate:
\sin 45 \degree
\cos 45 \degree
State the coordinates of point B.
Hence, evaluate:
\sin 135 \degree
\cos 135 \degree
The diagram shows P, which represents a rotation of 66 \degree around the unit circle:
Evaluate the following to two decimal places:
\sin 66 \degree
\cos 66 \degree
State the coordinates of point P.
Hence, find the coordinates of the point on the unit circle that represents a rotation of 114 \degree.
Evaluate the following to two decimal places:
\sin 114 \degree
\cos 114 \degree
\tan 114 \degree
Find the solutions, to the nearest degree, for the following equations where 0 \degree \leq \theta \leq 180 \degree:
\sin \theta = 0.7071
\cos \theta = 0.67
\sin \theta = 0.65
\cos \theta = - 0.22