(Sorry if I'm wrong)
Enlarged means making it bigger, so you're making it 3 1/2 times bigger.
Try multiplying both the area and perimeter by 3.5
(6 x 3.5) (8 x 3.5)
P = 21cm and A = 28cm
H=3.4s- start with the problem
20=3.4s- substitute the known number(s)
20/3.4=3.4/3.4 s- divide both sides by 3.4
The answer is about 5.88, your answer should be between 5 and 6
