The circles with centres C1 and C2 have equal radii of length rcm. The line C1 C2 is a radius of both circles. The two circles intersect at A and B. (a) Given that the perimeter of the shaded region is 4 pie cm, find the value of r.
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Answer:
3 cm
Step-by-step explanation:
The most important concept is the fact that AC1C2 is an equilateral triangle. Which means all angles and pi/3 (or as we say 60°)
Use this angle to find arc length, add both arc lengths and then equate them to 4 pi.
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