Roger Hui wrote:
What are the shapes of the 5 (identical) isosceles triangles that
make up a regular prism with a pentagonal base, with each
triangle leaning at 70 degrees (20 degrees from vertical)?
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Duh! What have I missed? The shape of any isosceles triangle is
"triangular".
Do you mean to ask the ratios of the subject triangles' sides or angles
to each other?
It would be kind to draw a diagram for us.
JCF
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