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| Hero's Formula |
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| Fig (i) Fig (ii) |
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| Fig (iii) |
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| Let D = area of triangle |
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| From figure (i), C < 90o (C is acute) and AD ^ BC. |
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| From figure (ii), C > 90o (C is obtuse) and AD ^ BC produced. |
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| From figure (iii), C = 90o. |
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| Alternate form |
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| Note: |
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| Slight manipulation of half anlge formulae lead to the following results. |
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