draw a diagram. The distance between centers is the sum of the radii, so if the circles have radii a,b,c we have
a+b=11
a+c=15
b+c=19
Now it's easy to figure out a,b,c.
Three circles touch each other externally. Their centres make a triangle with sides of 11cm, 15cm and 19cm. What are the radii of the three circles?
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