Dynamic Geometry: Langley's Problem,
Isosceles Triangle, 20, 50, 60, 80 Degrees, Angle. HTML5 Animation for Mobile Devices. Get Started Now  Click the Play Button Below! to start the stepbystep solution.
In isosceles triangle ABC (where AB = BC), point E lies on AB and point D lies on BC. Given that angle B is 20 degrees, angle DAC is 60 degrees, and angle ACE is 50 degrees, find the measure of angle ADE.
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