There are no triangles in a square. A triangle is a 3 sided figure. A square is a 4 sided figured classified as quadrilateral meaning it has 4 sides. A triangle can be any size, as long as it has 3 sides. A quadrilateral can also be any size it just has to have 4 sides as well.
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a square pyramid has 4 triangles
4 right triangles
A square based pyramid has 4 triangular faces and 1 square face.
Triangles are rigid, quadrilaterals are not - a square can be "squashed" into rhombus.
Five. Four triangles and one square make up a square pyramid.