A Triangle
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an isosceles triangle
Assuming that each vertex is used to connect exactly two sides, all two-dimensional shapes will have the same number of sides as vertices. So a shape with 4 sides will have 4 vertices and a shape with 3 sides will have 3 vertices. Think of a square (4 sides, 4 vertices) and a triangle (3 sides, 3 vertices).
Its sides, its angles and its vertices.
2-dimensional shapes, with three straight sides have three vertices.
Ah, polygons are like little friends with different personalities! The number of faces, edges, and vertices a polygon has depends on its shape. For example, a triangle has 3 sides, 3 vertices, and 3 angles. Remember, each polygon is unique and beautiful in its own way!