Aabc is an obtuse triangle. given that cb = 20, the measure of za = 30°, and the measure of zb = 45°, which of the
expressions listed would be used to find how long ca is? (note: for a abc, where a, b, and care the lengths of the
sides opposite za, zb, and zc, respectively, sir
wo sinza sinzb sinzc
abc
a = 20
45sin 20°
sin 30°
20 sin 30°
sin 45°
20 sin 45°
sin 30°
sin 45°
20 sin 30°