Math CentralQuandaries & Queries


Question from Jo:

Find the angle between the two sides of length 5 in an isosceles triangle that has one side of length 9 and two sides of length 5.

Hi Jo,

I can help get you started.

Draw a line from the vertex $P$ of the triangle where the two sides of length 5 inches meet to the midpoint $Q$ of the opposite side.


What do you know about triangle $PQR?$


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