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Lebar = ( K ÷ 2 ) - Panjang
Lebar = ( 145 ÷ 2 ) - 43
Lebar = 72,5 - 43
Lebar = 29,5cm
Luas Persegi Panjang
Luas = p × l
Luas = 29,5 cm × 43 cm
Luas = 1268,5 cm^2
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145=2(43+L)
L=(145:2)-43
L=72,5 - 43
L=29,5cm
luas=p×L
=43×29,5
=1268,5cm ->> hasil nya