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72=2(7x+5x)
72=24x
x=3
panjang=7.3=21 lebar=5.3=15
maka luas=p.l=21.15=315 cm² (B)
p:l = 7:5, misal=x
K= 2 (p+l)
72=2(7x+5X)
72=2 X 12x
72=24x
72/24=x
3=x
p= 7x= 7.3= 21 cm
l= 5x= 5.3= 15 cm
L= pxl
=21x15
=315 cm2