pentagonal square
a pyramid, in the sense that most people think of has a square base, with 4 triangle 'sides', which would be 5 faces. A regular tetrahedron has 4 equilateral triangles as faces.
a tetrahedron (triangular-based pyramid) has 5 triangular faces. * * * * * 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.
If all the sides are equal to 5 cm, then it's a equilateral triangle. An equilateral triangle is a triangle in which all the sides are equal.
5
If, by "sides" you mean faces, then the answer is a pentahedron.
If the base is a polygon with n sides, the pyramid will have n+1 faces. Triangle base (3 sides) gives 5 faces, Quadrilateral base (4 sides) has 5 faces, etc.
An isosceles triangle is a triangle that has two congruent or equal sides. For example, a triangle that has sides of 3,3, and 5.
Try it out... Draw a triangle with 5 cm sides and see if you can make them fit.
triangular pyramid-4 equal faces
No. In most cases NONE of them are triangles. Even in a triangle based prism, only 2 of the 5 faces are triangles.
It's not possible to have a right angle triangle with sides of equal length. The sides on a right angle triangle are always in the ratio 3:4:5.