<P> It has two lines of reflectional symmetry and rotational symmetry of order 2 (through 180 °). </P> <P> The dual polygon of a rectangle is a rhombus, as shown in the table below . </P> <Table> <Tr> <Th> Rectangle </Th> <Th> Rhombus </Th> </Tr> <Tr> <Td> All angles are equal . </Td> <Td> All sides are equal . </Td> </Tr> <Tr> <Td> Alternate sides are equal . </Td> <Td> Alternate angles are equal . </Td> </Tr> <Tr> <Td> Its centre is equidistant from its vertices, hence it has a circumcircle . </Td> <Td> Its centre is equidistant from its sides, hence it has an incircle . </Td> </Tr> <Tr> <Td> Its axes of symmetry bisect opposite sides . </Td> <Td> Its axes of symmetry bisect opposite angles . </Td> </Tr> <Tr> <Td> Diagonals are equal in length . </Td> <Td> Diagonals intersect at equal angles . </Td> </Tr> </Table> <Tr> <Th> Rectangle </Th> <Th> Rhombus </Th> </Tr>

How many sides of a rectangle are equal
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