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5×62=310 DISEDERHANAKan lagi 310:
62= 2( l+5) + 2( l )
= 2l + 10+ 2l
= 4l + 10
52= 4l
L= 52/4
=13cm
P= l + 5
=18cm
Luas= p*l
= 18*13
= 234 cm^2