MathDB
2001 Stanford Math Tournament Team #15

Source:

May 24, 2014
Stanfordcollegetrigonometrygeometrytrig identitiesLaw of Sines

Problem Statement

Let ABCABC be an isosceles triangle with ∠ABC=∠ACB=80∘\angle{ABC} = \angle{ACB} = 80^\circ. Let DD be a point on ABAB such that ∠DCB=60∘\angle{DCB} = 60^\circ and EE be a point on ACAC such that ∠ABE=30∘\angle{ABE} = 30^\circ. Find ∠CDE\angle{CDE} in degrees.
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