18 points are indicated on the perimeter of a triangle ABC (see figure). How many triangles are there with vertices at these points? a) 331 (b) 408 le) 710 (d) 711
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The total number of triangles with vertices at these points are 711/ 816.
Step-by-step explanation:
As we know that
There are total 18 points on the perimeter of a triangle.
Total = 18c3
= 18c3 - 7c3 - 7c3 - 7c3 / 18c3
= 711/ 816
Thus the total number of triangles with vertices at these points are 711/ 816.
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