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Question

Find area of the triangle with vertices at the points in each of the following

(2,7), (1,1), (10,8)


Solution

Required area =12∣ ∣2711111081∣ ∣=12|2(18)7(110)+1(810)|
=12|2(7)7(9)+1(2)|=12|14+632|=472sq. unit

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