Explanation
Logical Definitions
Let:
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S = The set of all Squares.
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R = The set of all Rectangles.
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Q = The set of Quadrilaterals with opposite sides equal, parallel, and four right angles.
1. Verification of Assertion (A):
By mathematical definition, a rectangle is a quadrilateral with four right angles (90∘). Since a square also has four right angles and equal opposite sides, it satisfies every requirement to be a rectangle.
Therefore, Assertion (A) is true.
2. Verification of Reason (R):
A rectangle requires:
Since a square has all four sides equal (a=b=c=d), it mathematically follows that its opposite sides are equal:
Because the square fulfills these criteria, Reason (R) is also true.
Conclusion
The reason provides the specific geometric criteria that a square meets in order to be classified as a rectangle.
Reason (R)⟹Assertion (A)
The correct answer is: Both (A) and (R) are true and (R) is the correct explanation of (A).