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If the base angles of a triangle are congruent, use the Law of Sines to show the triangle is isosceles.

User Ixchi
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Answer:

The Isosceles Triangle Theorem States that if a triangle contains 2 congruent sides, then the angles opposite those sides are congruent. This theorem can be proved using the Law of Sines: The Law of Sines states that: asinA=bsinB=csinC If a=c, making △ABC an isosceles triangle, then asinA=asinC!

User Rolandus
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