Name________________________________________
Practice Law of Cosines
A2.T21
1.
For
ABC find a to the nearest hundredth.
3.
For
ABC find the length of c to the nearest hundredth, given a  54, b  47, and m C  85 .
4.
For ABC find m A to the nearest tenth of a
degree.
2.
5.
For DEF find f to the nearest hundredth.
For ABC find m B to the nearest tenth of a
degree.
6. For ABC find m B to the nearest tenth of a degree, given a  7, b  6, and c  5.
7.
Find the length of the diagonal, d , of the
parallelogram to the nearest inch.
8.
A regular hexagon has side lengths of 15cm and
angles that measure 120 . Find FB .
You many use either the law of sines, or the law of cosines to solve. Round to the nearest whole number or degree.
9.
Find the missing dimensions of the triangle.
10.
Find the m C.
11.
Find the missing dimensions of the triangle.
12. Find f .
13.
Find the m DGF.
14.
15.
A person at point A looks due east and sees a UFO with an angle of elevation of 40˚. At the same instant,
another person, 1.0 miles dues west of A looks due east and sights the same UFO with an angle of elevation
of 25˚. Find the distance between A and the UFO. How far is the UFO from the ground?
16.
Two pedestrians walk from opposite ends of a city block to a point on the other side of the street. The angle
formed by their paths is 25˚. One pedestrian walks 300 feet, the other walks 320 feet. How long is the city block?
Find the m ABD .