alphageometry
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maybe a wrong rule?
the programm said, that in this case angle JIH = angle JKH
They use a non-traditional approach to the angle notation: "angle JIH" means "the angle between straight lines JI and IH". In this sense, the equality is correct. That is discussed in #17
They use a non-traditional approach to the angle notation: "angle JIH" means "the angle between straight lines JI and IH". In this sense, the equality is correct. That is discussed in #17
Why does that change anything?
You can refer to a tutorial about full, oriented, directed angle here They use this directed angle so the statement is correct.