Take three collinear points A, B and C on a page of your note book. Join AB, BC and CA. Is the figure a triangle ? If not, why?

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Solution

Let us consider three collinear points A, B and C and join AB, BC and CA.

The figure we get is not a triangle because it is a straight line consisting of only one side. It is also not a closed figure, whereas a triangle is defined as a closed figure consisting of three sides.

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Take three collinear points A, B and C on a page of your note book. Join AB, BC and CA. Is the figure a triangle ? If not, why?

Let us consider three collinear points A, B and C and join AB, BC and CA. The figure we get is not a triangle because it is a straight line consisting of only one side. It is also not a closed figure, whereas a triangle is defined as a closed figure consisting of three sides.

Let us consider three collinear points A, B and C and join AB, BC and CA.

The figure we get is not a triangle because it is a straight line consisting of only one side. It is also not a closed figure, whereas a triangle is defined as a closed figure consisting of three sides.