If they share a part or whole of a side and provided they do not overlap, then depending on the shape of the triangles, the result can be a triangle, quadrilateral or a concave pentagon.
Otherwise you can get other shapes such as a 6-pointed star.
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A triangle that has 2 equal sides is an isosceles triangle
It is 4/9 of the small triangle plus the size of the small triangle
Turn the 7 to form an angle with the other 7. It shapes a triangle.
If it is an equilateral triangle then it will have 3 equal angles If it is an isosceles triangle then it will have 2 equal angles plus another different size angle