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Question

Area of the triangle formed by (1, 1), (2, 5), (5, 2)

A
7.5
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B
5.7
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C
7
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D
5
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Solution

The correct option is A 7.5
We know we can find the area of triangle formed by (a1,b1),(a2,b2) and (a3,b3) using the formula
12∣ ∣a1b11a2b21a3b31∣ ∣
Area=±12∣ ∣111251521∣ ∣=12(1(52)1(25)+1(425))
=12(3+321)=152=7.5sq.mts.

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