Interior angles in a triangle add up to 180°. Interior angles in a quadrilateral add up to 360°. Symmetry and 2D shapes Parts of a shape on either side of a line of symmetry will be exact mirror ...
A shape has a line of symmetry when the folded part sits perfectly on top with all edges matching. The number of lines of symmetry in a regular polygon is equal to the number of sides. A shape has ...
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