a tetrahedron (triangular-based pyramid) has 5 triangular faces.
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No. A tetrahedron (as the name should suggest) has 4 faces - not 5. The question does not preclude additional sides nor faces. The answer, in fact, is a pentagonal pyramid.
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triangular pyramid-4 equal faces
An isosceles triangle has two sides of equal length.
There are 2 triangle base faces, and 3 rectangle faces. 5 total faces.
A nonagon has 9 sides and a triangle has 3. So there are (5*9)+(1*3) = 48 sides in 5 nonagons and 1 triangle.
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