yes, in a sq. or a rec. , all adjacent sides are perpendicular
Yes, otherwise it would be a different shape such as a rhombus or trapezium.
Rectangles. (Which includes squares.)
A square.
Generally no. If they are perpendicular, all four angles are right angles and the parallelogram is usually called a rectangle.
yes, in a sq. or a rec. , all adjacent sides are perpendicular
Adjacent sides are perpendicular. Opposite sides are parallel.
Yes, otherwise it would be a different shape such as a rhombus or trapezium.
all the sides
Square & Rectangle are the only two. Rhombus (diamond) & parallelogram have adjacent sides, but no 90 degree angles (not perpendicular).
Rectangles. (Which includes squares.)
A square.
Adjacent sides of the flags of all nations are perpendicular line segments.
All angles in a square are 90o so all adjacent sides are perpendicular to one another.
an equilateral triangle (all sides are adjacent and 60 degrees)
Generally no. If they are perpendicular, all four angles are right angles and the parallelogram is usually called a rectangle.
A rectangle (which also includes a square).