9. complete this item. identify 1 and 2. select all that apply of the following terms: acute, right, obtuse, adjacent, vertical, complementary, supplementary. (select all that apply! ) acute right obtuse adjacent vertical complementary supplementary

Right  ,vertical, supplementary

Step-by-step explanation:In the given figure the two rays are perpendicular.A line is said to be perpendicular to another line if the two lines intersect at a right angle.Thus <1 and <2 are Right angles.

The opposite angles formed by two intersecting lines are called vertical angles.<1 and <2 are on opposite sides of the two rays and hence form vertical angles.

The angles made at the intersection of the two rays are 90 degrees .So the sum of angles 1 and angle 2= 90+90=180 degrees.When two angles add to 180 degrees they are called supplementary angles .

Hence <1 and <2 are Right  ,vertical, supplementary angles.

c-4 is the final answer! : )