# ROTATION OF 2D SHAPES

Rotating the shape means moving them around a fixed point. There are two directions

i) Clockwise

ii) Counter clockwise (or) Anti clockwise

The shape itself stays exactly the same, but its position in the space will change.

 90° clockwise 90° counter clockwise180° 270° clockwise270° counter clockwise (x, y) ==> (y, -x)(x, y) ==> (-y, x)(x, y) ==> (-x, -y)(x, y) ==> (-y, x)(x, y) ==> (y, -x)

Problem 1 :

Rotation 90° clockwise about the origin. Solution :

Marking the coordinate,

Z (0, -4), J (0, -5), T (4, -3) and S (3, -5)

Rotation ==> 90° clockwise

Rule :

(x, y) ==> (y, -x)

Z (0, -4) ==> Z' (-4, 0)

J (0, -5) ==> J' (-5, 0)

T (4, -3) ==> T' (-3, -4)

S (3, -5) ==> S'(-5, -3) Problem 2 :

Rotation 180° clockwise about the origin. Solution :

Marking the coordinate,

E (-1, 0), R ( -3, -1), Q (-2, -4) and A (2, -3)

Rotation ==> 180°

Rule :

(x, y) ==> (-x, -y)

E (-1, 0) ==> E' (1, 0)

R (-3, -1) ==> R' (3, 1)

Q (-2, -4) ==> Q' (2, 4)

A (2, -3) ==> A'(-2, 3) Problem 3 :

Rotation 90° counter clockwise about the origin. Solution :

Marking the coordinate,

D (4, 2), F (4, 5) and B (5, 2).

Rotation ==> 90° counter clockwise

Rule :

(x, y) ==> (-y, x)

D (4, 2) ==> D' (-2, 4)

F (4, 5) ==> F' (-5, 4)

B (5, 2) ==> B' (-2, 5) Problem 4 :

Rotation 90° counter clockwise about the origin. Solution :

Marking the coordinate,

U (-4, 4), W (-5, 4), Q (-4, 0) and P (0, 2).

Rotation ==> 90° counter clockwise

Rule :

(x, y) ==> (-y, x)

U (-4, 4) ==> U' (-4, -4)

W (-5, 4) ==> W' (-4, -5)

Q (-4, 0) ==> Q' (0, -4)

P (0, 2) ==> P' (-2, 0) Problem 5 : Solution :

Marking the coordinate,

Y (-4, 3), B (-1, 5) and E (-3, 0)

Rotation ==> 180°

Rule :

(x, y) ==> (-x, -y)

Y (-4, 3) ==> Y' (4, -3)

B (-1, 5) ==> B' (1, -5)

E (-3, 0) ==> E' (3, 0) Problem 6 :

Rotation 90° clockwise about the origin. Solution :

Marking the coordinate,

R (-2, 3), M (-3, 0) and X (-1, 0)

Rotation ==> 90° clockwise

Rule :

(x, y) ==> (y, -x)

R (-2, 3) ==> R' (3, 2)

M (-3, 0) ==> M' (0, 3)

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