"What is the area? You should be able to solve this"

08062018, 10:08 PM
(This post was last modified: 08062018 10:27 PM by Albert Chan.)
Post: #5




RE: "What is the area? You should be able to solve this"
Another way, still using coordinate geometry, but without Shoelace formula:
Again, let A=(0,2), P=(x,y), B=(2,0) just sum the area like integration with trapezoid rule: bottom right area (3 points A, P, B) = (2+y)/2 * (x0) + (y+0)/2 * (2x) = 1/2 * (2x + x y + 2y  x y) = x + y it match the cordinate triangle area formula, without the magic. it is super easy messing up the "shoelace" Edit: just realized ijabott just said that in previous post. Sorry for the noise ... 

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