2-2 Polygons

Polygon: a closed plane figure with at least 3 sides.

12 sides = a dodecagon

11 - no name

Convex: diagonals on inside.

Concave: diagonals on outside.

Sum of Interior Angles: n-2(180)

2-3 Parallel and Perpendicular Lines in a Coordinate Plane

y = 3x+2

Slope intercept form: y = mx=b

M = Slope = Rise over Run

Plot First Angle B = y intercept

M = 3, Y intercept (0,2).

M = 3 = 3 over 1.

If Slopes are the same - Parallel Lines

If Slopes are reciprocals - Perpendicular

If Slopes are none of the above, neither.

Problem 1-1

Are the lines Parallel, Perpendicular, or neither?

Example

Y=3x+4 M=3

Y=3x-2 M=3

Parallel

Perpendicular.

None of the above

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