6 faces 1o edges and 8 corners
It has to be 90 degrees and yes, straight.
a right angle is half of a straight angle
Right angle (90) < Obtuse angle < Straight angle (180)
Acute angle=45 degrees Right angle = 90 degrees Straight Angle=180 degrees.
It is used to mark or scribe lines at 90 degrees (right angle) to a straight edge. Also used to check two adjacent edges are at 90 degrees (right angle)
A straight angle is an angle that is 180 degrees exactly (a straight line). A right angle is 90 degrees (like the corners of a square.)
An acute angle is an angle less than 90 degrees. A right angle is 90 degrees. A straight angle is a straight line. For example: take a 90 degree angle and straighten it out to form a line, and it becomes a straight angle.
A straight angle.
A right angle because 180* - 90* is 90* which is a right angle !
A zero angle or a straight angle.