4 right triangles
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a square pyramid has 4 triangles
when a square has even numbers like 4 inches on four sides, 2 triangles will have the same number on all three sides.
A square based pyramid has 4 triangular faces and 1 square face.
1. a square is made up of two triangles because if you draw a square and draw a diagonal line from right to left or left to right in the middle you will see how two triangles make a square.all sides should be of same length and all bond angles should be 90 in a square.
Triangles are rigid, quadrilaterals are not - a square can be "squashed" into rhombus.