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1. Nine points are arranged in a 3 x 3 grid, as shown below.  In how many different ways can you choose three points, so that they form a triangle?

 

 

2. A right isosceles triangle has a hypotenuse of 1.  What is the area of the triangle?

 Oct 3, 2021
 #1
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1. There are 44 ways of forming triangle.

 Oct 3, 2021
 #2
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There are 9C3 = 84 ways to choose 3 dots.

There are  8 ways that those 3 dots  can all be in a row.

So

I think that there are  84-8 = 76 different triangles that can be formed.

 Oct 8, 2021

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