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Question Number 77213 by A8;15: last updated on 04/Jan/20
Commented by A8;15: last updated on 04/Jan/20
proveα=
prove
Commented by mr W last updated on 05/Jan/20
youdidn′tsaywhatisyourquestion.whatistoprove?α+β+γshouldbe360°,soit′swrongwithγ=60,β=60,α=60!
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