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Re: In the rectangular coordinate system, what is the area of [#permalink]

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15 Feb 2014, 00:05

sanjoo wrote:

can we do this by distance formula..

square root (x2-x1)^2+(y2-y1)^2

I did that by this formula.. M geting 5, 5 and square root 50 respectively of three sides... so 5*5/2=12.5 Ans A.

is it rite? whats another aproach?

Yes you can do it with this formula... simplest and fastest approach. There are other approaches mentioned in the posts but those involve more steps. Like plotting a trapezium finding its area and then subtracting two 3-4-5 rt angled triangles to get the desired area.

Re: In the rectangular coordinate system, what is the area of [#permalink]

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29 Dec 2015, 12:48

Adding to the diagram by walker, if once calculates the area of the triangle that has QR as the hypotenuse, it comes to be a non-integer, which subtracted from a whole integer (28) would give a non integer.

The only non integer options is A
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