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यदि तीन बिन्दु (a, 0), (0, b) व (x, y) संरेख हैं तब सिद्ध कीजिए कि x/a + y/b = 1

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तीन बिन्दु (a, 0), (0, b), (x, y) संरेख हैं यदि ∆ का क्षेत्रफल = 0

1/2[(ab + 0 + 0) – (0 + bx + ay)] = 0

ab – bx – ay = 0

ab = bx + ay

1 = bx/ab + ay/ab

∴ x/a + y/b = 1

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