Investigate: Use strip and fasteners to make a triangle and a quadrilateral. Try to push inward at any one vertex of the triangle. Do the same to the quadrilateral. Is the triangle distorted? Is the quadrilateral distorted? Is the triangle rigid? Why is it that structures like electric towers make use of triangular shapes and not quadrilateral?

O is common to both the angles ˆ AOC and ˆ BOC.
No, the triangle is not distorted but the quadrilateral is distorted and also the triangle is rigid. Structures like electric towers make use of triangular shape so that they could not be distorted and they could be rigid.

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