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70=2(p+l)
35=p+l
p=35-l
pxl=300
(35-l)l=300
35l - l²=300
l² +35l -300=0
(l - 15) (l-20) =0
l=15 p=20
d²=p² + l²
d²=15² +20²
d²=625
d= 25