Check my answer somebody! :o

Question

anonymous · Answer

attachment

anonymous · Answer

Remember, the second pentagon has LONGER sides so the area has to be bigger than the first pentagon's area.

hartnn · Answer

side length increased so area should increase, right ?

hartnn · Answer

do it this way, 
s1/s2 = A1/A2

hartnn · Answer

s's are sides, A's are areas

anonymous · Answer

oh yeah. okay so its 371.55 cm

anonymous · Answer

Wouldn't the area of a pentagon with side lengths of 18cm be ~557 cm^2 though?

anonymous · Answer

The areas of the actual pentagons aren't proportional to each other.

anonymous · Answer

okay then how to find the area of a pentagon? ;o

hartnn · Answer

sorry, i meant 
(s1/s2)^2 = A1/A2
A2 = (9/4)*247 =555.75

hartnn · Answer

but area is proportional to side squared, right ?

anonymous · Answer

your formula is very confusing for me -__-

anonymous · Answer

Yeah, hartnn's process is easier than actually solving for the pentagon without paying attention to the other information they gave you.

hartnn · Answer

$A =ks^2 \A1=ks1^2 \A2=ks2^2$
dividing, we get 
$A1/A2=(s1/s2)^2$

anonymous · Answer

But I dont get what a and k and s is its too confusing, -__-

hartnn · Answer

A is area of pentagon
s is side of pentagon
k is constant of proportionality

anonymous · Answer

alright thank you!

hartnn · Answer

i hope you got that....
welcome anyways ^_^