Square (Option 1) has at least one pair of perpendicular sides
What is perpendicular?
"Perpendicular means two lines, or sides, that meet at a right angle. A right angle is the measurement of 90 degrees."
What are perpendicular sides?
"Perpendicular sides are at a 90-degree angle. Since they are so common, there is a special symbol to signify the sides are perpendicular without measuring."
Option 1
Squares are made up of two sets of parallel line segments, and their four 90° angles mean that those segments also happen to be perpendicular to one another.
Option 2
A parallelogram is a special kind of quadrilateral that is formed by parallel lines. The angle between the adjacent sides of a parallelogram may vary but the opposite sides need to be parallel for it to be a parallelogram.
Option 3
There are three angles in a triangle. These angles are formed by two sides of the triangle, which meets at a common point, known as the vertex. The sum of all three interior angles is equal to 180 degrees.
Option 4
A trapezoid is a quadrilateral with exactly one pair of parallel sides. Isosceles trapezoids have two sides which are equal sized and have the same angles between themselves and the bases.
Hence, Square (Option 1) has at least one pair of perpendicular sides
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