equilateral, isosceles and scalene
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triangles, squares and pentagons.
yes. When you are finding the area of a triangle you do the same for all types of triangles.
The polygons are the equilateral triangle, the square, and the regular pentagon. The faces of these platonic solids are made from the following polygons: tetrahedron - 4 triangles cube - 6 squares octahedron - 8 triangles dodecahedron - 12 pentagons icosahedron - 20 triangles
if you put 3 triangles together you get a bigger triangle.
If the 3 interior angles are the same then the triangles are similar