Draw an angle with the given measure in the standard position.

$$-\frac{2 \pi}{3}$$

Sketch the angle. Then find its reference angle.

$$240^{\circ}$$

Solve the triangle. Round measures of sides to the nearest tenth and measures of angles to the nearest degree.

$$A=50^{\circ}, a=2.5, c=3$$

Find the exact value of the function.

$$\sin 30^{\circ}-\sin 60^{\circ}$$

Draw an angle with the given measure in the standard position.

$$\pi$$

Sketch the angle. Then find its reference angle.

$$315^{\circ}$$

Determine whether the triangle should be solved by beginning with the Law of Sines or the Law of Cosines. Then solve the triangle. Round measures of sides to the nearest tenth and measures of angles to the nearest degree.

$$a=4, b=8, c=5$$

Write an equation involving $\sin , \cos$, or tan that can be used to find x. Then solve the equation. Round measures of sides to the nearest tenth and measures of angles to the nearest degree .

Solve the equation by finding the value of x to the nearest degree.

$$x=\operatorname{Sin}^{-1}$$

Solve the triangle. Round measures of sides to the nearest tenth and measures of angles to the nearest degree.

Triangle $A B C$ has a right angle at $C$, angle $B=30^{\circ}$, and $B C=6$. Find the area of triangle $A B C$. (A) 6 units $^2$ (B) $\sqrt{3}$ units $^2$ (C) $6 \sqrt{3}$ units $^2$ (D) 12 units $^2$

Find the exact value of the function.

$$3\left(\sin 60^{\circ}\right)\left(\cos 30^{\circ}\right)$$

Write an equation involving $\sin , \cos$, or tan that can be used to find x. Then solve the equation. Round measures of sides to the nearest tenth and measures of angles to the nearest degree. .

From the top of the cliff, a geologist spots a dry riverbed. The measurement of the angle of depression to the riverbed is $70^{\circ}$. The cliff is 50 meters high. How far is the riverbed from the base of the cliff?