The assessment for this lesson is a discussion of a mathematical statement. You will have to determine if the statement is true or false. If it is false you will explain your reasoning. You will also be asked to respond to at least two of your classmates. Before engaging in this discussion, view the discussion guidelines and the discussion rubric to ensure that you understand the expectations for the activity. For all real numbers a and b, 2a•b=a^2+b^2

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.