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zhane2015
Group Title
The area of a regular octagon is 35 cm². What is the area of a regular octagon with sides three times as long? (1 point)315 cm²
175 cm²
225 cm²
105 cm²
 one year ago
 one year ago
zhane2015 Group Title
The area of a regular octagon is 35 cm². What is the area of a regular octagon with sides three times as long? (1 point)315 cm² 175 cm² 225 cm² 105 cm²
 one year ago
 one year ago

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zhane2015 Group TitleBest ResponseYou've already chosen the best response.0
I just multiply the original area by 3 right??
 one year ago

dave0616 Group TitleBest ResponseYou've already chosen the best response.0
hmmm, im not sure if that is quite correct. personally i would find the sides of the octagon from the area equation and then redo the problem. Area of a octagon = side^2(2+2(sqrt(2))) 35cm^2=side^2(2+2(sqrt(2)) 35/(2+2(sqrt2)=side^2 7.25=side^2 sqrt(7.25)=side=2.69
 one year ago

dave0616 Group TitleBest ResponseYou've already chosen the best response.0
i would then multiply each side by 3 and plug that into the equation: 2.69*3=8.07 area=side^2(2+(2sqrt(2)) area=8.07^2(2+(2sqrt(2) area=315cm^2
 one year ago

zhane2015 Group TitleBest ResponseYou've already chosen the best response.0
Why multiply by 3?
 one year ago

dave0616 Group TitleBest ResponseYou've already chosen the best response.0
because each side is 3 times as long
 one year ago

dave0616 Group TitleBest ResponseYou've already chosen the best response.0
so that is why cant multiply the total area by 3, because it says that each side is 3times as long, not the total area is 3times as big
 one year ago

zhane2015 Group TitleBest ResponseYou've already chosen the best response.0
Oh ok...THANK YOU!!
 one year ago

dave0616 Group TitleBest ResponseYou've already chosen the best response.0
no problem
 one year ago
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