Question

PLEASE HELP, WILL GIVE 20 POINTS.

The dimensions of rectangle B are twice the dimensions of rectangle A. The area of rectangle A is 50 cm2. What is the area of rectangle B?

Answer 1

Answer:
`200cm^(2)`

Explanation:

To double the dimensions, you must multiply both the length and width by 2, so instead of just
`l*w=a`, you have
`2l*2w=b`, which can be simplified even further to
`2*2*l*w=b`

Now, multiply the 2s together to get 4, making the equation
`4lw=b`. Since
`lw` is
`a`, and
`b` is 4 times as much as
`a`, you just need to multiply the original area by 4 to get the new area.