Outside tangents

Calculate the length of the line segment S1S2 if the circles k1 (S1, 8cm) and k2 (S2,4cm) touch the outside.


x =  12


r1=8 cm r2=4 cm  x=r1+r2=8+4=12r_{1}=8 \ \text{cm} \ \\ r_{2}=4 \ \text{cm} \ \\ \ \\ x=r_{1}+r_{2}=8+4=12

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