Question #30654

1 Answer
Parabola
Jan 9, 2018

A=5.5

Explanation:

Since this is a rectangular gird, we use the formula A=b/2+I-1
where b is the number of boundery points and I is the number of the interior points.

We now count to get that the perimeter of the triangle only touches 3 points.

We now count again to see that there are 5 points inside the triangle.

Therefore, A=3/2+5-1
A=1.5+5-1
A=5.5

This method is extremely useful when you are dealing with shapes that are combinations of many other shapes.

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