An isosceles triangle has two vertex angles . true or false ?
See attachment for images of parts of an isosceles triangle. Google is helpful for answering questions such as those you are asking. Use Google. https://www.google.com/search?q=parts+of+an+isosceles+triangle&biw=1093&bih=522&tbm=isch&tbo=u&source=univ&sa=X&ei=3-d3VMDcBbfPsQSPxICYCg&sqi=2&ved=0CCkQsAQ
Vertex is used to indicate the 'top' or high point of something, such as the vertex of an isosceles triangle , which is the 'top' corner opposite its base, but this is not its strict mathematical definition.
The vertex angle of an isosceles triangle is defined to be the angle of the triangle formed by the two legs. I think you may have confused "apex" with "vertex." @AJ01
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