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Slope of the line
(y2-y2)/x2-x1)
Distance Formula
ā(x2-x1)Ā²+(y2-y1)Ā²
Midpoint Formula
(x1+x2)/2,(y1+y2)/2
Slope-Intercept
y=mx+b
Standard Form
Ax+By=C
Standard form slope
-A/B
standard form y-intercept
(0,C/B)
horizontal line
y=#. m=0`
vertical line
x=#, m=undefined
30-60-90 Triangle
Pythagorean Theorem
aĀ²+bĀ²=cĀ²
45-45-90 Triangle
Area of triangle
A=(1/2)bh
circle graph equation
(x-h)Ā²+(y-k)Ā²=rĀ²; center=(h,k)
circumference
2Ļr
Area of Circle
ĻrĀ²
Length of arc
(n/360)2Ļr; n=inner circle angle
area of sector
(n/360)ĻrĀ²
Inscribed Angle
mā BEC=1/2m.arcBC, m.arcBC=2*ā BEC