OK, SO a shape with fewer than four straight sides is a triangle, which has three (3) straight sides. Hope this helps!
LOOPDOP says: A circle is a shape. And it has no straight sides..... isn't that "fewer"?
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quadrilateral
It is any two-dimensional shape that has 4 sides formed by straight lines. It can be a square, rectangle, rhombus, rhomboid, parallelogram, or trapezoid. Its four included angles will total 360° (for a concave shape, one will exceed 180°).
The general name for a plane shape with four sides is a quadrilateral.
A parallelogram is a plane, or two-dimensional shape that is bounded by four straight lines which form its sides. Each pair of opposite sides consists of parallel and congruent (same length) lines.
A quadrilateral triangle is an impossible shape. A quadrilateral has four straight sides while a triangle has three.