Scale Factor then Area
A rectangle has a length of 8 meters and a width of 2 meters. If you create a copy of the rectangle and use a scale factor of 5, how many times larger will the new area be than the original area of the rectangle?
25 times the original
What is the perimeter of this rectangle ?
length=9 miles
width = 7 miles
scale factor is 3
96 miles
If the scale factor from A to B is 3/5. What is the scale factor from B to A?
5/3
Janice is making a scale drawing of her car. She decides that one foot of the car will equal 8 squares on her graph paper. If the car is five feet tall then how many squares will that be on her graph paper?
40 squares
triangle A 2 in, 5.5 in, 8 in
triangle B. 4 in, 11 in, 16 in
scale factor from A to B?
2
A parallelogram has a base of 9 inches and a height of 8 inches. If you create a copy of the rectangle and use a scale factor of 7, how many times larger will the new area be than the original area of the parallelogram?
49 times larger than the original
What is the perimeter of this rectangle?
length=9 ft
width = 8 ft
scale factor is 7
238 ft
An image of a desk shown on a website is 2.5 inches wide and 3 inches tall on a computer monitor. The actual desk is 30 inches wide. What scale is being used for the image?
An image of a desk shown on a website is 2.5 inches wide. The actual desk is 30 inches wide. What scale factor is being used to go from the image to the actual desk?
12
Ian drew a scale drawing of her computer screen in a mural on the wall. The image on the screen which is 5 mm long, is 20 m long in the mural. What is the scale of the drawing?
1mm: ___ m
4 meters
triangle A 56 in, 64 in, 80 in
triangle B. 7 in, 8 in, 10 in
scale factor from A to B?
1/8
A square has a side length of feet. If you create a copy of the square and use a scale factor of 1/4, how much of the original area would the new area be?
1/16 times the original area
What is the perimeter of this square ?
length= 6 km
width = 6 km
scale factor is 1/2
12 km
Definition of a scaled copy
A copy of an image that has the same shapes and angles but can be different sizes
The map on your phone indicates that 1 inch equals 12 miles. On your phone, the store is exactly 2.5 inches from your current location. How far away is the store from where you are?
30 miles away
triangle A 16 in, 20 in, 12 in
triangle B. 4 in, 5 in, 3 in
scale factor from A to B?
1/4
find the area of the rectangle
length= 12 m
width = 24 m
scale factor = 1/6
eight meters squared
What is the perimeter of this rectangle?
length=4 km
width = 1 miles
scale factor is 1/4
2 1/2 or 2.5
The copy is larger than the original when the scale factor is ________. Give an example of the scale factor ..
greater than one
The scale on a map is 1 inch = 2 1/2 miles. The distance between two streets on the map is 1 3/4 inches. What is the actual distance between these streets?
4 3/8 miles
Fill in the missing side length
original - 12, 16, 17
copy - 6, 8, ?
scale factor = 1/2
8.5
find the area of the triangle
base = 2.5 in
height = 6 in
scale factor = 4
120 in squared
What is the perimeter of this triangle?
Side lengths: 3 in, 9 in, 18 in
Scale factor = 1/3
10 inches
The copy is smaller than the original when the scale factor is ________. Give an example of the scale factor ..
less than one
Joseph is making a scale model of an airplane that is 12 inches long. If the box says that that 3/4 inch equals 4 feet then how long is the real plane?
64 feet
What is the scale factor of this rectangle?
original sides- 4, 7
copy sides- 10, 17.5
(written as a fraction)