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'Partly Circles' printed from http://nrich.maths.org/
Here are three problems involving circles.
Can you solve them and describe ways in which each might be
connected to one or both of the others?
Why does ab = cd?
These three circles are drawn so that they touch each other and
their centres are all on the line AB.
If CD is $8$ units in length, what is the area of the part that is
If the area shaded yellow is equal
to the area of the larger of the two circles that are shaded blue,
what is the relationship between the radii of the three