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kll persegi panjang = 2.5 + 2.(2x + 5) = 10+2.12 =10+24=34
nb : titik itu samadengan kali
l=5
L=pxl
50=(2x+3)5
50=10x+15
50-15=10x
35=10x
x=3,5
p=2.3,5+3 = 10cm
kll = 2 (p+l)
= 2(10+5)
=2.15 =30cm