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A triangle is drawn on a coordinate system. It has the following vertices: (2,4) (3,0) (0,0)

Find its area. (Vertices from top then right then left respectively)

 

Is it 12? (By shoelace formula)

 Jul 16, 2020
 #1
avatar+110727 
0

No it is not.

Draw the triangle on a rough number plane.

Then use the formula

 

area of a triangle =  half the base times the perpendicular height to find the answer.

 

Get back to us with your answer and maybe your working too.

 

To other answerers:

Please do not give more information.

 Jul 16, 2020
 #2
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Hi Melody,

Yes, I know I can find its area just using the number plane.

I was trying to apply "Shoelace formula" with simple polygons like this triangle to see if it works or not (Of course there is easier ways for this one!). But when it comes to polygons with 5 vertices...

So if someone can let me know how to apply it correctly ,thx!

Guest Jul 16, 2020
 #3
avatar+110727 
-2

You asked if the answer was 12.

If you knew an easy way to do it then why did you not check your answer for yourself?

Next time do your own checking!

And phrase your questions properly so that people know exactly what you are intending to ask.

I answered the question that you asked!

Melody  Jul 16, 2020
 #4
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I wrote "12 (By shoelace formula" thus i wanted checking using this method. sry if it was not that clear!

Guest Jul 16, 2020
 #5
avatar+110727 
-2

Yes that is what you wrote.

 

You said that you did it by shoelace method. Which was wrong.

 

You did not say that you knew how to do it in any other way whatsoever. Nor did you say you knew of any other answer. Nor did you say you needed or even wanted it done by this shoelace method your yours.

 

I assumed you were a 10 year old who was only just learning about areas.

 

So you were extremely clear. You clearly asked for something you did not need or want.

As it turns out you were also clearly too lazy to check your answer for yourself, which you say you could have done easily.

 Jul 16, 2020
edited by Melody  Jul 16, 2020

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