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D1 = 36 , MAKA R 18
D2 = 16 = maka r 8
P = 26
maka :
GL² = P² - (R-r)²
GL² = 26² - (18-8)²
GL² = 676 - 100
GL = √576
GL = 24 cm
jadi panjang Garis singgung persekutuan luarnya adalah 24 cm (B)
=26²-(18-8)²
=26²-10²
=676-100
l²=576
l=√576=24cm
p=panjang A-B
l=persekutuan luar
r1-2=jarijari 1-2