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  1. s
  2. s
  4. s
    • s = (a+b+c)/2
  1. ρa
  2. ρa
  4. ρa
    • ρa = A/(s-a)
  1. ρb
  2. ρb
  4. ρb
    • ρb = A/(s-b)
  1. ρc
  2. ρc
  4. ρc
    • ρc = A/(s-c)
  1. ρ
  2. ρ
  4. ρ
    • ρ = s/A
    • ρ = 1/(1/ρa+1/ρb+1/ρc)
  1. A
  2. A
  4. A
    • A = ρa(s-a)
    • A = ρb(s-b)
    • A = ρc(s-c)
    • A = s/ρ
    • A = (ρ·ρa·ρb·ρc)1/2
  1. a
  2. a
  4. a
  1. b
  2. b
  4. b
  1. c
  2. c
  4. c
Excircles to a triangle: radii, sides, area and inscribed circle

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