# Outer contact of circles

Construct a circle k1 (S1; 1.5 cm), k2 (S2; 2 cm), and K3 (S3; 2.5 cm) so that they are always two outer contact. Calculate the perimeter of the triangle S1S2S3.

Result

o =  12 cm

#### Solution:

$o=2 \cdot \ (1.5+2+2.5)=12 \ \text{cm}$

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