Which of the following is a key element in the proof of the law of cosines?
a. the triangle inequality theorem
b. angle a+ angle b+ angle=180
c. a=1/2b*h
d. d=square root of (x^2+x^1)+(y^2-y^1)^2

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)