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70= 2(p=l)
35=p+l
p= 35-l
luas= pxl
p x l = 300
(35-l) l =300
35l - l² = 300
l² + 35l +300 =0
(l - 15) (l-20)
l= 15 p= 20
D²= 15² + 20²
D² = 625
D =25