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Why isint a traingle a quadrilateral?
It is not a quadrilateral because quadrilaterals are figures that have four sides (thus the use of quad meaning four). A triangle only has three
What are the 5 plane figures?
There are infinitely many plane figures, not just five! A circle, ellipse, A triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, and on and on. And then there are mixed figures such as a semicircle, a segment of an ellipse. Not forgetting plane figures that have "random" boundaries.
What is the inverse of all quadrilaterals are four-sided figures?
There exists at least one quadrilateral which is not 4-sided.
What is a quadrilateral mean in maths?
It means four sides, and refers to plane figures bounded by four straight sides.
Is a trapiziod always a quadrilateral?
Yes. "Quadrilateral" means all possible figures that have four sides. Some of them are parallelograms, some are rhombera, some are rectangles, some are squares, some are nothing in particular, and some are trapezoids.
