Problem 101. Equilateral Triangle, Pythagoras, Angles.
High School, College
In the diagram below, given an
equilateral triangle ABC, D is an interior point. If
a2 = b2 +c2 prove that the measure of angle BDC is
equal to 150°.
View or post a solution.
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HINTS:
Pythagorean Theorem Converse
Congruence of Triangles SAS
The sum of the measures of the
three angles of a triangle is
180.