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| Commensurable and incommensurable quantities |
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| Two quantities are said to be commensurable if their ratio can be expressed as the ratio of two integers. |
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| Examples: |
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| a) Ratio of Rs.20 to Rs. 48 |
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| Rs.20, Rs.48 are commensurable. |
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 , 4 are incommensurable |
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| (Ratio cannot be expressed in terms of integers, |
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| c) Ratio of the side of square to its diagonal. |
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| Hence side of a square and its diagonal are not commensurable. |
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