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15x^2 = 240
x^2 = 240 :15
x^2 =16
x=4
mka panjang = 5x = 5.4 = 20
lebar = 3x = 3.4= 12
keliling nya = 2.(p+l)
= 2.(20+12)
=2.32
=64
c.64
15x=240
x^2=16
x=4
maka :
p=5×4=20
l=3×4=12
keliling : 2(p+l)
2(20+12)=40+24=64cm