8th Grade Masters of Unit 2 Review!

Scaling

Dilations

Similarity

Slope

Ms. Linford Wild Card

EXTREME

100

How do we create a scale copy of any shape? I need answers, bruh.

we multiply all the lengths in the original figure by the same number.

100

All of the triangles are dilations of Triangle D. The dilations use the same center P, but different scale factors. What do Triangles A, B, and C have in common?

Ms. Linford, they all be fractions because they smaller than D, bruh.

100

How do I know when two figures are similar?

if one figure can be transformed into the other by a sequence of translations, rotations, reflections, and dilations.

I'll also accept: same angles, side lengths are scale factors (because of dilation)

100

How in the world do I find a slope when I only have two pairs of coordinates? UUUUGGGGHHH

y₂ - y₁

________

x₂ - x₁

100

Tell me with your words from your face, why is ABC similar to ADE

Here are the words: they share angle A as a center of dilation. They have the same other angles. You can totally tell that ABC is a dilation of ADE by scale factor of 3 OR ADE is a dilation of ABC with a scale factor of 1/3. Do I win the points?

100

What's that slope, yo?

8/4 = 2/1 = 2

200

Yo boi B!

200

Triangle ABC is dilated using D as the center of dilation with scale factor 2 to create the prime image. Miranda says the two triangles are congruent, because their angle measures are the same. Do you agree?

MIRANDA! Guuuuurl, you know better. Do better. They aren't congruent. Bridget gonna tell you why...

200

How do I know that these triangles are similar?

Ms. Linford!!! There are several ways you can tell. They are on the same line, they have the same slope. You can translate A to C then use C to dilate to a scale factor of 2.

200

If I have a slope of 3, what does that really mean anyway?

rise over run. Go up 3, over 1. It is like saying 3/1

200

Here are some line segments. Which one is not a dilation of BC?

Bruh, ED is so off.

200

What are points a and b?

I'm just gonna do the up 2, over 1 play...

b = 6

a = 5

300

What are the side lengths for C?

Yo, I got you. The side lengths are 4.25 in. and 5.5 in.

300

Segment AB measures 3 cm. Point O is the center of dilation. How long is the image of AB after a dilation with a scale factor of 5?

Dude. Stawp. It's 15.

300

Are these rectangles similar?

If I've told you once, I've told you a thousand times. THEY AIN'T SIMILAR because you can only have one scale factor and this would be two. SMH.

300

What is the slope?

The slope is 1.

The slope is 1/1.

The slope is 5/5.

300

True or false: Dilations take perpendicular lines to perpendicular lines.

True! "I just guessed, Ms. Linford."

Thanks for your honestly. Just remember, once perpendicular, always perpendicular because we aren't about changing that shape, just the size.

300

What needs to stay "congruent" in a dilation? OR what is the only thing that stays congruent in a dilation?

Bruh, them angles.

400

True or False: If two rectangles are not scaled copies of one another, then the diagonals match up.

False! That totally wrong, bruh.

400

If A is the center of dilation, how can we find which point is the dilation of with scale factor 2?

It's gotta be C. Hear me out. D is way too close. It's like 1/3, which would make B x1. Boom. C. Bet.

400

Triangle DEF is a dilation of triangle ABC with scale factor 2. In triangle ABC, the largest angle measures 82^o. What is the largest angle measure in triangle DEF?

*wide eyed stare from Linford* You best say 82^o because the anfles never change.

400