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Wednesday, November 02, 2005

late scribe

Sorry everyone this is late but my computers bin messed up for about a week nowand I'm in Mr class room right now doing yesterday's blog.

So yesterday we did a lot of dictionary writing in the beginning of class.We started with an an Analytic Geometry toolkit.

The Pythagorean Theorem = a2 + b2 = c2

Slope of a line = rise/run =y2 - y1/x2 - x1 =y1 - y2/x1 - x2
(a.k.a rate of change)
Mid point of a line segment mid = (x1 - x2/2,y1 - y2/2)

Distance between two points

Perpendicular (shortest) distance line: Ax + By + C = 0
between a line and a point Point: (x,y)

Equation of Lines
-General from = Ax + By + C = 0
-Slope intercept form = y = mx + b
*point slope form = y - y1 = m(x - x1)
-if two lines are parallel
with slopes of m1 & m2 = m1 = m2
-if two lines are Perpendicular
with slopes m1 & m2 = (m1)(m2) = -1

Some trig we should know

Sine Law = sinA/a = sinB/b = sinC/c

Cosine Law = a2 = b2 + c2 - 2bc cos

A System of liner equations
2 lines meet at:
*One point
*All points
*No points

Then after all that we did a quiz and that was class.
And I'm doing todays blog to so ill say who's the next scribe then.


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