Scale Drawings
What is a Scale Factor?
The number multiplied to the original to create the copy.
How can you tell if a table is proportional?
Each number in the left column is multiplied by the same number to get to the right column.
-5 + 12 =
7
An item sells for $48. tax is 5%. What is the total amount you will pay?
$50.40
Two angles are complementary. One angle is 32 degrees. What is the measure of the other angle?
58 degrees
What two criteria must be in place in order for a copy to be a true scaled copy?
2. All angles are the same as the original.
A graph starts at the origin and then curves up. Is it proportional? Why or why not?
-8 - 18 =
-26
Your lunch cost $12.60. You want to leave a 15% tip. How much is the tip?
$1.89
Two angles are supplementary. One angles measures 55 degrees. What is the measure of the other angle?
125 degrees
The side length of the original is 15. The scale factor is 3. What is the corresponding side length of the copy?
45
The graph is straight but does not begin at the origin. Is it proportional? Why or why not?
No because it does not begin at the origin.
-10 - 12 - (-8) =
-14
An item sells for 456.50 and is on sale for 30% off. What is the sales price?
$319.55
The diameter is 12 inches. What is the circumference?
36.68 inches
The side length of the original is 18. The corresponding side of the copy is 3. What is the scale factor?
1/6
The graph is proportional and includes the coordinates (3, 12). What are the coordinates for the Constant of Proportionality?
(1, 4)
-3 x 8 x -2 =
48
You invested $500 at 12% for 3 years. What is the total amount of interest earned?
$180
The radius is 8 inches. What is the area?
200.96 sq. inches
The side length of the copy is 12. The scale factor is 1/4. What is the side length of the original?
48
The left side of a table of numbers is 24. The corresponding right side is 8. What is the CP?
1/3
-8 x 8 - (-12/2) + -5 x 7
-93
Waves were predicted to be 10 ft. high. Instead, they were 12 ft. What is the % of error?
About 17%
The circumference is 34.54 inches.
a) What is the diameter?
b) What is the radius?
c) What is the radius?
a) 11 inches
b) 5.5 inches
c) 94.985 sq. inches