A problem by Abhishek Singh
Level
pending
Let ABC be a triangle with angleA = 90 and AB = AC. Let D and E be points on the segment BC such that BD : DE : EC = 3 : 5 : 4. What is the measure of angle DAE?
The answer is 45.
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1 solution
It's elementary, just use cosine rule in triangle ADB, DAE and AEC.