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QuestionMathematics

True or False: a. A rhombus is a parallelogram with four congruent sides. b. A rectangle is a parallelogram with four right angles. c. A square is a rectangle and a rhombus. d. A rhombus is always a square. e. Every parallelogram is a regular quadrilateral. f. In a rectangle, the diagonals are perpendicular.
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Answer

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Step 1:
I'll solve this problem step by step, carefully following the LaTeX formatting guidelines:

Step 2:
: Analyze the definition of a rhombus

A rhombus is a quadrilateral with four congruent sides. This means all sides are equal in length, but the angles do not need to be right angles.

Step 3:
: Evaluate statement a

\text{Statement a: A rhombus is a parallelogram with four congruent sides.}
This is TRUE. A rhombus is defined as a parallelogram where all four sides are equal in length.

Step 4:
: Evaluate statement b

\text{Statement b: A rectangle is a parallelogram with four right angles.}
This is TRUE. A rectangle has four 90 -degree angles and opposite sides are parallel.

Step 5:
: Evaluate statement c

\text{Statement c: A square is a rectangle and a rhombus.}
This is TRUE. A square has: - Four right angles (like a rectangle) - Four equal sides (like a rhombus) - Therefore, it satisfies both conditions

Step 6:
: Evaluate statement d

\text{Statement d: A rhombus is always a square.}
This is FALSE. A rhombus has four equal sides, but its angles are not necessarily right angles. Only when all angles are 90 degrees does a rhombus become a square.

Step 7:
: Evaluate statement e

\text{Statement e: Every parallelogram is a regular quadrilateral.}
This is FALSE. A regular quadrilateral must have both equal sides and equal angles. A general parallelogram does not meet this condition.

Step 8:
: Evaluate statement f

\text{Statement f: In a rectangle, the diagonals are perpendicular.}
This is FALSE. In a rectangle, the diagonals are equal in length but not perpendicular.

Final Answer

a. TRUE b. TRUE c. TRUE d. FALSE e. FALSE f. FALSE