Answer:

Triangle (3-sided polygon):

Equilateral triangle: all sides have equal length

Isosceles triangle: two sides have equal length, while the third side is different

Scalene triangle: all sides have different lengths

Quadrilateral (4-sided polygon):

Square: all sides have equal length, and all angles are right angles (90 degrees)

Rectangle: opposite sides have equal length, and all angles are right angles (90 degrees)

Parallelogram: opposite sides are parallel and have equal length

Trapezoid: one pair of opposite sides are parallel, while the other pair is not necessarily parallel

Step-by-step explanation:

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