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 Circles:  A =π r 2 : d=¿  πd Polygons: S i =( n 2) 180 : diag= n ( n 3) 2 Alt-Hypt: h 2 =  xy : b 2 =  xc : a 2 = yc Pythagorean Theorem: a 2 +b 2 =c 2 Quadratic: b ± √ b 2 4 ac 2 a Slope:  y 2  y 1  x 2  x 1 Midpoint: (  x 1 + x 2 2 ,  y 1 + y 2 2 !istance "ormula:  x 2  x 1 ¿ ¿ ¿ √ ¿ " amilies o# T riangles: $%-&%-'%: -  √ 3 - ) *+-*+-'%: - -  √ 2  $-*-+: +-)-$: -)*-)+: .-+-  T rig: sin/01H cos/A1H ta n/01A

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Circles: d Polygons: : Alt-Hypt: Pythagorean Theorem: Quadratic: Slope: Midpoint: (,)Distance Formula: Families of Triangles:30-60-90: x - x- 2x45-45-90: x - x - x 3-4-5: 5-12-13: 7-24-25: 8-15-17Trig: sin=O/H cos=A/H tan=O/A