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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

We know that in a parallelogram, opposite sides are equal and the diagonals bisect each other. suppose ABCD is the parallelogram named in order, then consider the triangles COD and AOD CO=OA [diagonals bisect each other] ∠COD=∠AOD= 90°. [given] OD=OD [common] ∴Triangle COD congruent to Triangle AOD. ⇒ AD=CD [CPCT] ⇒CD=AB ⇒AD=BC ⇒AD=CD=BC=AB ∴All sides are equal. ∴ABCD is a SQUARE.

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