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ISL 1988 Problem 40

    i.) Consider a circle KK with diameter AB;AB; with circle LL tangent to ABAB and to KK and with a circle MM tangent to circle K,K, circle LL and AB.AB. Calculate the ration of the area of circle KK to the area of circle M.M.

    ii.) In triangle ABC,AB=ACABC, AB = AC and ∠CAB=80∘.\angle CAB = 80^{\circ}. If points D,ED,E and FF lie on sides BC,ACBC, AC and AB,AB, respectively and CE=CDCE = CD and BF=BD,BF = BD, then find the size of ∠EDF.\angle EDF.

    Dataset text AI-MO AoPS. Quoted with source.

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