(M7) Geometry Warmup Lesson

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Explanation Slide...

If the scale factor k is greater than 1, the object will get bigger (enlarge). If k is less than 1...a fraction...the object will get smaller (be reduced).

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Directions: Complete the statement to make it true.



William had a book report on 8" x 11" paper. He wants to reprint it using a scale factor of 3. This will ​

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the paper.

Graphing

See the black point? Pretend that it is one of the points of a square. Dilate by a scale factor of 1/4 ... and plot the new point. Write down the pre-image point coordinates (4,8)...multiply each number by k=1/4, and find the new coordinates of the "image."

Multiple Choice

These squares are similar: FACE ~ PLNT

Stack these letters. Which statement must be true?

• FA corresponds to NT

• AC corresponds to LN

• NT corresponds to AC

• CE corresponds to PL

Fill in the Blanks

Find x. Write your words ( $\frac{L\arg e}{Small}$ ) ... then setup your proportion. Keep all the parts in order. Use the butterfly method.

Multiple Choice

Which proportion can be used to find x? You write a proportion. Realize that yours may be upside down...and that is ok.

• A

• B

• C

• D

Multiple Choice

Triangle ABC ~ ANT (they are similar). Which side of ANT corresponds to side AC?

Stack the letters so you can answer the question.

• AT

• AN

• BC

• NT

Fill in the Blanks

Finish the Similarity statement based on the picture. Use the markings to help.

ABC ~