Question Number 77213 by A8;15: last updated on 04/Jan/20
Commented by A8;15: last updated on 04/Jan/20
$${prove} \\ $$$$\alpha= \\ $$
Commented by A8;15: last updated on 04/Jan/20
$${prove} \\ $$
Commented by mr W last updated on 05/Jan/20
$${you}\:{didn}'{t}\:{say}\:{what}\:{is}\:{your}\:{question}. \\ $$$${what}\:{is}\:{to}\:{prove}? \\ $$$$\alpha+\beta+\gamma\:{should}\:{be}\:\mathrm{360}°,\:{so}\:{it}'{s}\:{wrong} \\ $$$${with}\:\gamma=\mathrm{60},\:\beta=\mathrm{60},\:\alpha=\mathrm{60}! \\ $$