Similar shapes Flashcards

1
Q

What does enlargement mean?

A

To make something bigger.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does reduction mean?

A

To makes something smaller.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a scale factor ?

A

We usually assign it the letter k . And it tells us how much to times by to get a new shape (either a reduction or an enlargement).

For example, if k=2, this means the image is twice as big as original shape.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does image​ when talking about transformations?

A

It’s the new shape that comes out after the transformation.

You can think of it like a picture. When you take a picture, you get an image. It looks a lot like the real thing you took a picture of, but it’s not exactly the same.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What’s the definition of “similar figures”?

A

The ratio of corresponding sides is the same for all of the shape’s sides.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How do you use angles to prove two triangles are similar?

A

Show that two angles are the same.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which angles of intersecting lines are the same?

A

The opposite ones.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which angles on these parallel lines are the same?

A

The ones inside the “Z” *and opposite angles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What do we know about angles that are reflected on a mirror (or water surface)?

A

The angles next to the mirror (or water) are the same.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do you show these triangles are similar?

A
  1. Common angle (the shapes literally use the same angle).
  2. Z-rule (since the lines are parallel).
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do you show these triangles are similar?

A
  1. Opposite angles of intersecting lines.
  2. Z-rule (since the lines are parallel).
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do you show these triangles are similar, given that the bottom is reflective water?

A
  1. Z-rule (since the lines are parallel).
  2. Angles reflecting off water (or a mirror) are the same.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is an “angle of elevation”?

A

It’s the angle between the floor and an upward line.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is an “angle of depression”?

A

It’s the angle between the ceiling and a downward line.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly