They can be. There are 4 types of triangles: scalene, equilateral, right, and isosceles. A triangle can only be isosceles under the circumstance that it has at least 2 equal sides.
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Isosceles triangles can be used in domes
Yes- but not all isosceles triangles are right triangles. Isosceles means that two sides are the same length, and two angles are the same.
no
Equilateral triangles have 3 equal sides whereas isosceles triangles have only 2 equal sides
No because isosceles triangles are 2 dimensional shapes.