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If a quadrilateral has equal diagonals but unequal and non-parallel adjacent sides, then which of the following quadrilaterals can it be?
  • a)
    Parallelogram
  • b)
    Rhombus
  • c)
    Isosceles trapezium
  • d)
    Kite
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
If a quadrilateral has equal diagonals but unequal and non-parallel a...
To determine which quadrilateral can have equal diagonals but unequal and non-parallel adjacent sides, we need to analyze the properties of each option: a) parallelogram, b) rhombus, c) isosceles trapezium, and d) kite.

1. Parallelogram:
A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length. The diagonals of a parallelogram bisect each other, meaning they divide each other into two equal parts. Since the adjacent sides are unequal and non-parallel, a quadrilateral with these properties cannot be a parallelogram.

2. Rhombus:
A rhombus is a quadrilateral with all sides of equal length. The diagonals of a rhombus bisect each other at right angles, meaning they divide each other into two equal parts. However, since the adjacent sides are unequal and non-parallel, a quadrilateral with these properties cannot be a rhombus.

3. Isosceles Trapezium:
An isosceles trapezium is a quadrilateral with two parallel sides (the bases) and two non-parallel sides (the legs) with equal length. The diagonals of an isosceles trapezium are equal in length. Moreover, the adjacent sides are unequal and non-parallel, satisfying the given conditions. Therefore, a quadrilateral with these properties can be an isosceles trapezium.

4. Kite:
A kite is a quadrilateral with two pairs of adjacent sides that are equal in length. The diagonals of a kite intersect at right angles, but they are not necessarily equal in length. Therefore, a quadrilateral with equal diagonals but unequal and non-parallel adjacent sides cannot be a kite.

Hence, the correct answer is option 'C' - isosceles trapezium.
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Community Answer
If a quadrilateral has equal diagonals but unequal and non-parallel a...
The quadrilateral which has equal diagonals but unequal and non-parallel adjacent sides can be an isosceles trapezium.
ABCD is an isosceles trapezium, with AD = BC and AB parallel to DC. Diagonals AC and BD are equal.
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