Thread: Coordinate geometry!
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Old June 24th, 2009, 08:45 PM
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The slope of a line that is perpendicular to a line whose slope is 3/8 is:

Ans:-8/3
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

Question repeated

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: (\frac{x_1+x_2}{2})(\frac{y_1+y_2}{2})

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?
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