using a compass draw 3 concentric circles of radii 2 cm 5mm, 3 cm 5 mm, 4 cm respectively
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three circles with centres A,B and C touch each other externally
at P,Q and R respectively and the radii of these circles are
2cm,3cm and 4cm
by joining the centres of triangle ABC formed in which,
AB=2+3=5cm
BC =3+4=7cm
CA=4+2=6cm
therefore, perimeter of the triangle ABC=AB+BC+CA
=5+7+6
=18cm
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