A. A complementary angle is an angle that, with another angle, adds up to360°. If m∡A = 77°, its complementary angle must be 283° because 360-77=283.
b. If two different angles are complementary to the same angle, they must have the same measure, because only one number can add with the one number to get the same answer.
to get the equation of any straight line, we simply need two points off of it, let's use those two points in the picture below.
keeping in mind that for the point-slope form, either point will do, in this case we used the second one, but the first one would have worked just the same.