Question Number 140899 by ajfour last updated on 14/May/21
Commented by ajfour last updated on 14/May/21
Commented by ajfour last updated on 14/May/21
$${construction}\:{method}\:{please}.. \\ $$$${AQ}=\mathrm{1}\:,\:{AB}={c} \\ $$$${we}\:{have}\:{to}\:{extend}\:{B}\:{till}\:{P} \\ $$$$\:{BP}={s}−{c}\:\:\:\:\left({s}\:{unknown}\right) \\ $$$${such}\:{that}\:{a}\:{line}\:{from}\:{P}\:{takes}\:{a}\: \\ $$$$\bot\:{turn}\:{at}\:{T}\:{and}\:{arrives}\:{at}\:{Q}. \\ $$$${how}\:{do}\:{we}\:{get}\:{at}\:{how}\:{much}\:{to} \\ $$$${extend}\:{B}\:{till}\:{P}\:\Rightarrow\:\:{BP}\:={s}−{c} \\ $$$${or}\:{AP}\:=\:{s}\:=\:? \\ $$