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प्रश्न
Show that the points A, B, C with position vectors `2hati- hatj + hatk`, `hati - 3hatj - 5hatk` and `3hati - 4hatj - 4hatk` respectively, are the vertices of a right-angled triangle. Hence find the area of the triangle
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उत्तर
Given
`veca = 2hati - hatj + hatk`
`vecb = hati -3hatj - 5hatk`
`vecc = 3hati - 4hatj - 4hatk`
then
`bar(AB) = vecb - veca`
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