Question

If the dimensions of a rectangle are doubled, then the area of the rectangle is

unchanged.
multiplied by 2.
multiplied by 3.
multiplied by 4.

Answer 1

@mathslover

Answer 2

My answer is b

Answer 3

You can do this by considering a pretend rectangle. Let's say the dimensions are 2 and 1 - in this case, the area is 2. If you double the dimensions, so now they're 4 and 2, the resulting area is 8, and so the correct answer would be d

Answer 4

oh my god...you actually taught me. thank you.

Answer 5

Thank you for helping me

Answer 6

If the radius of a circle is multiplied by 2, then how many times larger is the circumference of the new circle?

2.
4.
8.
.

Answer 7

I chose 4

Answer 8

Or, more mathematically, if A=b*h, then if you double them both, you have A=2b*2h and you can see that it will be multiplied by 4.

Answer 9

(pleasure) :)

Answer 10

for the second question, my answer was right?

Answer 11

The circumfrence of a circle is 2 * pi * r - so if you double the radius, you go up by 2. So the correct answer would be a

Answer 12

wow....youre so good at explaining:))

Answer 13

r only appears once, so there is a direct relationship - if you double it, the circumference doubles.