Question

The area of a regular octagon is 35 cm2. What is the area of a regular octagon with sides five times as long?
A. 625 cm2

B. 875 cm2

C. 175 cm2

D. 245 cm2

Answer 1

I thought it was C but I got it wrong =(

Answer 2

It really should be C... Weird..

Answer 3

Maybe it is an answer key issue- it is an autoscored exam. Do you think it is worth it to dispute it? Or could we be wrong?

Answer 4

Hold on... Let me work it again.

Answer 5

I got B

Answer 6

Yes, it is B because you need to remember that 5 needs to be 5x5 for the entire figure. So it would be 35x25.

Answer 7

Thank you guys so much! Sometimes the simplest part is the easiest to forget. It makes perfect sense now. THANK YOU!

Answer 8

\[\frac{ 8a^2\sqrt3 }{4 }=35\]
\[\frac{ 8(5a)^2\sqrt3 }{ 4 }=x\]

Answer 9

No problem. Glad I remember something. :P I'm weak in math.

Answer 10

A parallelogram has sides measuring 23.8 m and 35.3 m. The height corresponding to the 23.8-m base is 9.9 m. Find the height, to the nearest tenth of a meter, corresponding to the 35.3-m base.
A. 8317.4 m

B. 14.7 m

C. 6.7 m

D. none of these

Answer 11

This is the last one I am having trouble with. I thought it was B but got it wrong.

Answer 12

@lissa_bug I am the same- math kicks my butt! =(

Answer 13

the area of parallelogram is : side times height corresponding to that side, so
23,8*9,9=35,3*h

Answer 14

what is h then?

Answer 15

h=6.67

Answer 16

so it would be C

Answer 17

yes

Answer 18

Thank you again! Not sure how I messed that one up. But you explain things in easy to understand terms.

Answer 19

yw:)