Ptolemy's theorem | Desmos

Expression 8: "A" Subscript, "B" , Baseline times "C" Subscript, "D" , Baseline plus "A" Subscript, "C" , Baseline times "B" Subscript, "D" , Baseline

equals

90.5 6 3 8 6 5 6 5 6 7

8

Triangle

9

Line Segments

14

Side Lengths

18

Circle

25

Coordinates

36

Sliders

43

Points

50

73

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Start black, "A" End black

Start black, "B" End black

Start black, "C" End black

Start black, "D" End black

Start black, "A" "D" times "B" "C" equals "A" "B" times "C" "D" positive "A" "C" times "B" "D" End black

Start black, "A" "D" times "B" "C" equals "A" "B" times "C" "D" positive "A" "C" times "B" "D" End black

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