a geometric shape made up of 20 triangles. :)
A triangle that can be made in more than one way
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.
a tetrahedron is made of four triangles and has 4 vertices.
There are an infinite number of options. Even sticking with polygons with sides of the same measure, a hexagon can be made from 6 equilateral triangles, or 4 eq triangles and a 60 degree rhombus, or 2 eq triangles and 2 60-deg rhombi, or 3 60-deg rhombi. Each of the equilateral triangle could be made from smaller shapes. Eg four equilateral mini-triangles to make 1 triangle. Or 2 mini-triangles and 1 mini-rhombus or 2 60-deg mini-rhombi. And then each of those mini triangles could be made up of smaller micro-shapes. And so on ...
An isosceles triangle can be divided into 4 smaller, identical isosceles triangles. Each of these can then be divided into 4, and each of them ... So, the answer to the question is infinitely many.
8
The Great Pyramids at Giza are, but the Meso-Americans were truncated.
It would depend on the triangles, but assuming they were equilateral or isosceles, a trapezoid if alternated in a line.
There are normally no parallelograms within an isosceles triangle unless you put them there yourself.
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
Absolutely. Any two congruent right triangles will form a rectangle, and if the right triangles are isosceles right triangles, they will form a square.
20 isosceles triangles with each base being a side of the 20-gon, and the opposite vertices at the center of the polygon.
If you have 2 EQUILATERAL triangles, and you stack them on their respective hypotenuses, the result: SQUARE. If you have 2 ISOSCELES triangles, and you stack them on their respective hypotenuses, the result: RECTANGLE. If you have 2 OBTUSE triangles, and you stack them on their respective hypotenuses, the result: PARALLELOGRAM.
Inscribed triangles in a rectangle are identical right triangles but they are rotated 180 relative to each other.
50% because a trapezoid is made from 2 triangles
Well, honey, you're gonna need 20 short isosceles triangles to build that fabulous Icosahedron. Each face of the Icosahedron is made up of an isosceles triangle, and there are 20 faces in total. So, do the math and get building, darling!