Download presentation

Presentation is loading. Please wait.

1
Rotations Section 9.4

2
Rotations A rotation is a transformation in which a figure is turned about a fixed point called the center of rotation. Rays drawn from the center of rotation to a point and its image form the angle of rotation.

3
**Coordinate Rules for Rotations about the Origin**

When a point (a, b) is rotated counterclockwise about the origin, the following are true: For a rotation of 90o counterclockwise, (a, b)→(-b, a) For a rotation of 180o counterclockwise, (a, b)→(-a, -b) For a rotation of 270o counterclockwise, (a, b)→(b, -a) 90o counterclockwise = 270o clockwise 180o counterclockwise = 180o clockwise 270o counterclockwise = 90o clockwise If counterclockwise/clockwise is not stated, assume it is counterclockwise.

4
Rotations Quadrilateral RSTU has vertices R(3, 1), S(5, 1), T(5, -3), and U(2, -1). What are the coordinates of the vertices after a rotation of 270o counterclockwise about the origin.

5
Rotations Trapezoid has vertices E(-3, 2), F(-3, 4), G(1, 4) and H(2, 2). Find the vertices of the image for a 180o rotation about the origin.

6
Rotations Trapezoid has vertices E(-3, 2), F(-3, 4), G(1, 4) and H(2, 2). Find the vertices of the image for a 90o rotation clockwise about the origin.

7
Assignment p.602: 3-11

Similar presentations

OK

Geometry Rotations. 2/14/2016 Goals Identify rotations in the plane. Apply rotation formulas to figures on the coordinate plane.

Geometry Rotations. 2/14/2016 Goals Identify rotations in the plane. Apply rotation formulas to figures on the coordinate plane.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on sources of water supply Ppt on financial management system Ppt on oxidation and reduction for class 10 Ppt on accounting standards 11 Ppt on uses of concave and convex mirror Ppt on nitrogen cycle and nitrogen fixation is carried Download ppt on global warming in hindi Ppt on cost centre accounting Ppt on web designing Ppt on travelling salesman problem branch and bound