EugeneC's answer to liang liang's Primary 6 Maths Geometry Singapore question.

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EugeneC
Eugenec's answer
169 answers (Tutor Details)
Let the diameter of the smaller circle be x
Radius of bigger circle = diameter of smaller circle = x
6cm = radius of bigger circle + radius of smaller circle
= x + x/2

12cm = 3x

x = 4cm (radius of bigger circle)