Standard 8.G.1 Verify experimentally the properties of rotations, reflections, and translations (include examples both with and without coordinates). a. Lines are taken to lines, and line segments are taken to line segments of the same length

Vocabulary for this standard: rotation, reflection, translation, line, line segment, coordinates

Illustrative Math Lesson 1.1 Moving in the Plane

EngageNY lesson link – This appears in the second module of the EngageNY curriculum.

Quick thoughts:

A

**rotation**is the turning of an object by an angle about a fixed point.A

**reflection**is the operation of exchanging all points of a mathematical object with their mirror images.A

**translation**is a transformation consisting of a constant shift with no rotation or stretching.A

**line**is a straight geometric object with no thickness, extending in both directions without end (infinitely).A

**line segment**is a part of a line that is bounded by two distinct endpointsA

**coordinate plane**is a two-dimensional surface on which we can plot points, lines and curves.A

**ray**is a line with a single endpoint (or point of origin) that extends infinitely in one direction.An

**angle**is the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.A

**degree**a measurement of a plane angle, defined so that a full rotation is 360 degreeAn

**acute angle**an angle smaller than a right angle (it is less than 90 degrees)An

**obtuse angle**an angle of greater than 90° and less than 180°.Warm up

Vocab

- Kahoot
- Quizizz
- Quizlet
- Shmoop Video: Transformations

Instruction:

- Desmos

Drills:

- Quizizz
- Kahoot
- Formative