Geometry scale factor

[rachelmaddie]

I need help with setting up the proportion for scale factor for question #10.

 

[Harry_the_cat]

Convert feet to inches first.

 

[rachelmaddie]

Convert feet to inches first.

12 x 15 feet = 2160 inches?

Convert feet to inches first.

How do I convert in this case?

 

[rachelmaddie]

Convert the banner from feet to inches for both sides to be measured in the same units.
12 inches = 1 foot
15 x 12 = 180
ratio = one side of the photo/one side of the banner
10/180
By dividing both sides by 10
10/180 = 1/18
The scale factor is 1:18

 

[Harry_the_cat]

Just check the order of your answer.

 

[rachelmaddie]

Just check the order of your answer.

Larger/smaller?

 

[rachelmaddie]

Convert the banner from feet to inches for both sides to be measured in the same units.
12 inches = 1 foot
15 x 12 = 180
ratio = one side of the photo/one side of the banner
180/10
By dividing both sides by 10
180/10 = 18/1
The scale factor is 18:1

 

[Harry_the_cat]

1:18 implies a reduction while 18:1 is an enlargement.

I would say the scale factor is 18.

Have you been told to express it as a ratio?

 

[rachelmaddie]

1:18 implies a reduction while 18:1 is an enlargement.

I would say the scale factor is 18.

Have you been told to express it as a ratio?

No, the question does not specify

 

[Harry_the_cat]

Ok, a scale factor is usually just a number rather than a ratio.

 

[rachelmaddie]

Ok, a scale factor is usually just a number rather than a ratio.

Convert the banner from feet to inches for both sides to be measured in the same units.
12 inches = 1 foot
Convert 12 x15 feet to inches
15 x 12 = 180
ratio = one side of the photo/one side of the banner
180/10 = 18
The scale factor is 18

 

[rachelmaddie]

I need help with setting up the proportion for scale factor for question #10.

I’m still confused about this question

 

[Deleted member 4993]

I’m still confused about this question

Write down - explicitly - what is it that you wanted to find?

Now tell us EXACTLY where you are confused?

 

[rachelmaddie]

Write down - explicitly - what is it that you wanted to find?

Now tell us EXACTLY where you are confused?

I didn’t know if the answer was suppose to be in the form of a ratio or a number.

 

[lev888]

I didn’t know if the answer was suppose to be in the form of a ratio or a number.

Scale factor is a number.

 

[rachelmaddie]

Scale factor is a number.

Is my work correct then?

 

[lev888]

Is my work correct then?

Looks good.

 

[rachelmaddie]

1:18 implies a reduction while 18:1 is an enlargement.

I would say the scale factor is 18.

Have you been told to express it as a ratio?

I’ve been told to express it as a ratio..

 

[lev888]

I’ve been told to express it as a ratio..

How do you convert scale factor to a ratio?
We want to go from "a = 18*b" to "the ratio of a to b is x/y (or x:y)". What's x/y?

 

[rachelmaddie]

How do you convert scale factor to a ratio?
We want to go from "a = 18*b" to "the ratio of a to b is x/y (or x:y)". What's x/y?

18:1