30,60,90 triangle
Hypotenuse = 2x, Side oppositie 30 degrees = x, the final side is x root 3
45,45,90 triangle
hypotenuse = x root 2, other sides = x
a^0
1
(a^x)(a^y)
a^x+y
(a^x)/(a^y)
a^x-y
(a^x)^y
a^xy
a^-x
1/a^x
Quadratic formula
-b±[√b²-4ac]/2a
quadratic equation
ax² + bx + c = 0
Distance Formula
d = √[( x₂ - x₁)² + (y₂ - y₁)²]
Midpoint formula
(x₁+x₂)/2, (y₁+y₂)/2
Slope-intercept form
y=mx+b
Difference of squares
a^2 -b^2 = (a+b)(a-b)
i
root - 1
i^2
-1
i^3
-i
i^4
1
arc length
Arc = Circumference(Central Angle/360 )
Sector length
Sector = Area(Central Angle/360)
Equation of circle
(x-h)²+(y-k)²=r²