90 degrees
Two sides and they meet each other at 90 degrees.
Right triangle. Two angles are 45 degrees, and the third angle is 90 degrees. Two sides are equal.
If all of its exterior angles are 90 degrees then it will have 4 sides
A side on any square or rectangle -- improvement -- Not quite. 90 degrees looks like the junction of two sides of a square or rectangle.
Seven. They are: Cubic - all angles 90 degrees, all sides equal length Trigonal - all angles 90 degrees, two sides equal and the third unequal Orthorhombic - all angles 90 degrees, no sides equal Hexagonal - two angles 90 degrees and one angle 120 degrees, two sides unequal and the third unequal Trigonal - all angles equal but not 90, all sides equal Monoclinic - two angles 90, one more than 90, and no sides equal Triclinic - no angles equal, no sides equal For a graphical representation of these, see http://en.wikipedia.org/wiki/Crystal_system#Classification_of_lattices
no. if it contained two 90 degree angles it would have to have at least four sides.
90 degrees
A rhombus
The sides are equal The angle between adjacent sides is 90 degrees There are two diagonals The diagonals are equal in length The diagonals make 90 degrees with each other The diagonals make 45 degrees with the sides
If all four sides are the same length and one of the angles is 90 degrees. Or all angle are 90 degrees and two adjacent sides are of equal length.
Two sides and they meet each other at 90 degrees.
A rectangle.
Right triangle. Two angles are 45 degrees, and the third angle is 90 degrees. Two sides are equal.
If all 4 sides are equal and the angles are not 90 degrees it is a rhombus.
If all of its exterior angles are 90 degrees then it will have 4 sides
In its normal orientation the parallel sides of a trapezium are horizontal. In that case it will have no perpendicular lines. But turn the figure through 90 degrees and it has two!In its normal orientation the parallel sides of a trapezium are horizontal. In that case it will have no perpendicular lines. But turn the figure through 90 degrees and it has two!In its normal orientation the parallel sides of a trapezium are horizontal. In that case it will have no perpendicular lines. But turn the figure through 90 degrees and it has two!In its normal orientation the parallel sides of a trapezium are horizontal. In that case it will have no perpendicular lines. But turn the figure through 90 degrees and it has two!