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A 4 sided shape has 4 vertices whereas a 3 sided shape has 3 vertices.
A shape with four sides has more vertices because there are more points where edges (straight lines) meet than a 3-sided shape.
An isosceles triangle is a triangle (3-sided, 2-dimensional shape), 2 sides of which are equal in length. Any triangle which is not equalateral
isosceles triangle
A triangle only has 3 sides, but a 10 sided shape is called a decagon