Straight Lines Flashcards by Hector .

Q

Centroid

A

x1+x2+x3/3 , y1+y2+y3/3

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Q

Incenter

A

ax1+bx2+cx3/a+b+c

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Q

Orthocenter

A

m1m2 = -1

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Q

Intercept form

A

x/a + y/b = 1

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Q

Symmetric form

A

x-x1/cosθ = y-y1/sinθ = r

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Q

slope =

A

-a/b

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Q

x intercept =

A

-c/a

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Q

y intercept =

A

-c/b

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Q

Angle b/n 2 lines

A

tanθ = |m2-m1/1+m1m2|

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Q

Eqn perp to ax+by+c=0

A

bx-ay+λ = 0 or |ax1+by1=c/√a^2+b^2|

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Q

Ratio in which 2 pts divide a line

A

-(ax1+by1+c/ax2+by2+c)

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