a.
To find: The name of a quadrilateral which is symmetrical across both the diagonals.
a.

Answer to Problem 17PSB
If a quadrilateral is symmetrical across both the diagonals, it is a rhombus.
Explanation of Solution
Given Information:
The quadrilateral is symmetrical about both the diagonals
Rhombus has two reflection symmetry across the diagonals.
This means, both the sides of a diagonal look alike.
Thus we can say that the rhombus is symmetrical about both of its diagonals.
Hence, if a quadrilateral is symmetrical about both the diagonals, it is a rhombus.
b.
To find: The name of a quadrilateral which is symmetrical across exactly one diagonal.
b.

Answer to Problem 17PSB
If a quadrilateral is symmetrical acrossexactly one diagonal, it is a kite.
Explanation of Solution
Given Information:
The quadrilateral is symmetrical across one diagonal;
Kite is a quadrilateral that has only one line of symmetry and that is one of its diagonals.
This means, one of the diagonal create a reflection in kite.
Thus we can say that the kite is symmetrical about one of its diagonals.
Hence, if a quadrilateral is symmetrical acrossone of the diagonals, it is a kite.
c.
To find: The name of a quadrilateral which has four axes of symmetry.
c.

Answer to Problem 17PSB
A quadrilateral having 4 axes of symmetry is a square.
Explanation of Solution
Given Information:
Quadrilateral has four axes of symmetry
Square is a quadrilateral that has only four axes of symmetry.
Two along the diagonals and the other two along the lines parallel to its sides and passing through its centre.
Hence, a quadrilateral having 4 axes of symmetry is a square.
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