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Step-by-step explanation:

Your answer...... 21 cm^2

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Answer:

the quadrilateral is a rhombus as its all four sides are equal (of 4cm) each

Area of rhombus = 1/2 (digonal 1 × digonal 2)

= 1/2 ( 7×6 )

= 1/2 ( 42)

= 21

hence area of quadrilateral is 21 cm square