Describing Transformations in 8th Grade Math

Mr. Ohashi introduces a lesson on describing sequences of transformations, focusing on mapping triangle ABC onto triangle RST. He explains the steps involved in performing these transformations, including rotation and translation, and highlights the importance of accurately describing each step. The lesson also covers alternative methods for achieving the same result and encourages students to check their work against a detailed answer key. Mr. Ohashi offers support for any questions and concludes with encouragement for the students.

What do you need to have ready for today's lesson?

• A ruler

• A calculator

• Your notes

• The printed assignment 6-4

What does it mean when a triangle is mapped onto another?

• The triangles are similar in size

• The triangles are reflected

• The triangles overlap with the same orientation and location

• The triangles are congruent

What is the first step in the example sequence of transformations?

• Translate the triangle

• Reflect the triangle

• Rotate the triangle 90 degrees about the origin

• Rotate the triangle 180 degrees about the origin

After rotating the triangle 90 degrees about the origin, what is the next step?

• Translate it 4 left and 2 down

• Translate it 2 right and 4 up

• Translate it 4 left and 4 down

• Translate it 2 left and 4 down

What information is necessary when describing a rotation transformation?

• The angle of rotation and the direction

• The angle of rotation and the point of rotation

• The direction and the distance

• The point of rotation and the distance

In the alternative method, around which point is the triangle rotated?

• Point C

• The origin

• Point B

• Point A

How many possible ways are there to describe a sequence of transformations?

• Two

• One

• Several

• Infinite

What should you include when describing a translation transformation?

• The point of rotation and distance

• The angle and point of rotation

• The distance and direction

• The angle and direction

What should you do to ensure your transformations are correct?

• Guess and check

• Use a calculator

• Check the detailed answer key

• Ask a friend

What should you do if you have questions about the assignment?

• Message or email the teacher

• Skip the question

• Ask a classmate

• Wait until the next class