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zhane2015
 2 years ago
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
zhane2015
 2 years ago
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

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zhane2015
 2 years ago
Best ResponseYou've already chosen the best response.0I just multiply the original area by 3 right??

dave0616
 2 years ago
Best ResponseYou've already chosen the best response.1hmmm, 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

dave0616
 2 years ago
Best ResponseYou've already chosen the best response.1i 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

dave0616
 2 years ago
Best ResponseYou've already chosen the best response.1because each side is 3 times as long

dave0616
 2 years ago
Best ResponseYou've already chosen the best response.1so 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
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