How can we solve proportions? ( 2 words)

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

Is the square root of 4 plus the square root of 16 rational?