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Question

Prove that the diagonals of a rectangle bisect each other. [4 MARKS]

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Solution

Properties: 1 Mark
Proof: 1 Mark
Steps: 2 Marks


In a rectangle opposite sides are equal and parallel.

In ΔOAD and ΔOCB,

ODA=OBC

[Alternate interior angles; ADBC and BD as transversal]

AD = BC [Opposite sides of a rectangle are equal]

OAD=OCB

[Alternate interior angles; ADBC and AC as transversal]

Hence ΔOADΔOCB [By ASA congruence rule]

Equating the corresponding parts of congruent triangles, we get:

AO = CO

BO = DO

Diagonals of a rectangle bisect each other.


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