Question

The area of artful at octagon is 35cm2. What is the area of the regular octagon with sides eight times as long? PLEASE I REALLY NEED HELP, I NEED AN ANSWER BY 12AM!!

Answer 1

Answer choices
A:280cm2
B:1600cm2
C:2240cm2
D:350cm2

Answer 2

The forumla for a regular octagon is

A=2(1+ √2)a^2

Answer 3

But it gives me a completely different answer.

Answer 4

this is the formula not the answer

Answer 5

Because the area varies as the square of the sides, it will result in an increase of 8^2 or 64 times the original size by a factor of 8 for the sides.

Answer 6

a = 8 cm
The area of an octagon = 2 x (1 + √2) x a²

Area = 2 x (1 + 1.414213562) x 8²
Area = 2 x (2.414213562) x 64
Area = 4.828427124 x 64

Calculate to get the answer.

Answer 7

@justus so i think this is a good job - explication - but in calcule when we use sqrt(2) - is enough to use just 1,41 not so much decimals - my opinion

Answer 8

\(\color{#0cbb34}{\text{Originally Posted by}}\) @jhonyy9
@justus so i think this is a good job - explication - but in calcule when we use sqrt(2) - is enough to use just 1,41 not so much decimals - my opinion
\(\color{#0cbb34}{\text{End of Quote}}\)
Oh thanks, I see what you mean. Thank you for your opinion I will keep it simple next time.

Answer 9

yw

Answer 10

\(\color{#0cbb34}{\text{Originally Posted by}}\) @justus
The forumla for a regular octagon is

A=2(1+ √2)a^2
\(\color{#0cbb34}{\text{End of Quote}}\)
formula you wan write there ....