Question

The scale factor of the blueprint of a garage door to the actual garage door is 0.05. the are of the actual garage door is 220 ft^2.

What is the area of the garage door on the blueprint?



A. 0.55ft^2


B. 5.5ft^2


C. 11ft^2


D. 55ft^2

Answer 1

take the square root of 220 to get side lengths

which is approximately 0.742

multiply it by 0.05 to scale it

which is approximately 14.832

square it to get the area of the new scaled object

and your left with 0.55ft^2

not; this method is inefficient but I don't remember the amount by which area scales to side lengths :P

Explanation:

Answer 2

take the square root of 220 to get side lengths

which is approximately 0.742

multiply it by 0.05 to scale it

which is approximately 14.832

square it to get the area of the new scaled object

and your left with 0.55ft^2

not; this method is inefficient but I don't remember the amount by which area scales to side lengths :P

Explanation: