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PG² = 26² - (15-5)²
PG² = 676 - 10²
PG² = 676 -100
PG² = 576
PG = √576
PG = 24
Maka panjang garis singgung persekutuan luar adalah 24 cm
R = 15 cm
R = 5 CM
P = 26 CM
dit : Grs singgung persekutuan Luar (GL)
maka :
GL² = P² - (R-r)²
GL² = 26² - (15-5)
GL² = 676 - 100
GL = √576
GL = 24 cm
jadi Grs singgung persekutuan Luar (GL) = 24 cm