The slope of a line that is perpendicular to a line whose slope is 3/8 is:
The product of the gradients of two lines that are perpendicular to each other is -1
The equation of the line through point (- 4, 0) and parallel to the y-axis is
Ans:x = -4
In the figure, M and N are midpoints of RT and ST. What is the length of MN?
Ans: b - a
Midpoint of a line:
A square has symmetry with respect to a line containing a median of the square.
Forgive my ignorance please. What's the median of a square?