Look at the quadrilateral below.
Determine if the quadrilateral is a rectangle.
Look at the quadrilateral below.
Determine if the quadrilateral is a rectangle.
From the given information, we know that triangle EBC is equilateral.
In an equilateral triangle, all angles are equal to each other.
Therefore, angle B is equal to 60 degrees.
Since none of the angles are 90 degrees, we can safely say that the quadrilateral is not a rectangle.
It is not a rectangle.