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The Area of a Rhombus is Equal to Half the Product of its Diagonals

Here we will prove that the area of a rhombus is equal to half the product of its diagonals.

Solution:

Given:

PQRS is a rhombus whose diagonals are PR and QS. The diagonals intersect at O.

To prove: ar(rhombus PQRS) = 12 ×PR × QS.

            Statement

              Reason

1. ar(∆RSQ) = 12 ×Base × Altitude

                  = 12 ×QS × RO.

1. QS ⊥ PR, because diagonals of a rhombus are perpendicular to each other.

2. ar(∆PQS) = 12 ×Base × Altitude

                  = 12 ×QS × PO.

2. As in reason 1.

3. ar(∆RSQ) + ar(∆PQS)

                  = 12 ×QS × (RO + PO).

3. By addition from statements 1 and 2.

4. ar(rhombus PQRS) = 12 ×PR × QS.

4. By addition axiom for area.





9th Grade Math

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