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100/5= 20
panjang = 3x20=60
lebar = 4x20=80
keliling= 2(60+80)= 280 m
luas= 60x80= 4800 m
berarti 3x , 4 x
maka diagonal d² = (3x)² . (4x)²
100 = 25X²
10=5x
x=2
maka luasnya 3x.4x
maka 3.2 . 4.2 = 48
kelilingnya (3.2 + 4.2 ) .2 = 28