mohon bantuan nya..............

Pakai RUMUS PYHTAGORAS

[tex]{BA}^{2} = {AO}^{2} - {BO}^{2} \\ \: \: \: \: \: \: \: \: = {20}^{2} - {12}^{2} \\ \: \: \: \: \: \: \: \: = 400 - 144 \\ BA= \sqrt{256} = 16cm[/tex]
GARIS SINGGUNG AB= 16 cm

** maaf klo salah