? With what? AD? Make an equilateral triangle for the edge.
? ∠BAD=∠CAE?
In a triangle? ABD and triangle? Ace clock
AB=AC
AD=AE
∠BAD=∠CAE
So what? Triangle? ABD and triangle? ACE? suit
So CE=BD=5
∠CDE=∠CDA+∠ADE=? 30+60? =90?
So in Rt triangle CDE? Medium;
DE=3,CE=5
CD=? four
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