Level 3

Circle formula:

(x-h)2 + (y-k)2. = r2 

Circles: The radius can be broken into the horizontal distance

x-h (distance bwt x-coordinates)

circles: Vertical distance :

y-k (distance from vertical points) 

circles:  When finding arc length 

Ex: C = 12, find arc length of a section thats 60 degrees

• 60/360 = 1/6 

• ⅙ (12) is 2 = arc length 

• Same with sector area, just replace C with A

circles: inscribed angle

inside angle is ½ of the bigger one

Convert between degrees and radians 

d = r * 180/pi 

r = d * pi/180

Triangles: 

• Congruent

  
  
  

• = copies 

triagnles: Similar =

scaled up or down

• Can be proved by AA, SSS, SAS, but NOT SSA

Box Plots

• Show a data sets min, 25th percentile, 50th percentile (median) , 7th percentile, and max