A 90 degree rotation is a quarter of a turn.
follow this formula (x,y)->(-y,x)
90
Rotation preserves shape - therefore the angle before the rotation equals the angle after the rotation.
You went 360o in the same direction, so you end up with a circle.
90 degree
follow this formula (x,y)->(-y,x)
plz awnser this
90
90 degrees
90 degree anticlockwise.
Rotation preserves shape - therefore the angle before the rotation equals the angle after the rotation.
the numbers
The formula used to calculate the surface of a 90 degree elbow is pi^2 *. This formula is taught in geometry class.
A square.
Rotation
(x, y)-----> (-x, -y)
The effect of the rotation is the same as that of a 90 degree clockwise rotation. In matrix notation, it is equivalent to [post-]multiplication by the 2x2 matrix: { 0 1 } {-1 0 }