What do you call two angles that have a sum of 90 degrees?

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab

This circle is centered at the origin, and the length of its radius is 6. what is the circle's equation? a. x^2+y^2=36 b x^2+y^2=6 c x+y=36 d x^6+y^6=1

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?