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Verified answer
P-l= 6 cml=p-6
K = 2 (p+l)
= 2 (p+p-6)
=2p+2p-12
= 4p-12
4p-12 = 84
4p= 84+12
= 96
p=94/4
p=24 cm
l = p- 6
= 24 -6
= 18 cm
L=pl = 24 x 18 = 432 cm²
Verified answer
Mapel : MatematikaBab : Bangun Datar
Persegi Panjang
p = 6 cm + l
Keliling = 2 x ( p + l )
84 cm = 2 x ( 6 cm + l + l )
84 cm = 2 x ( 6 cm + 2l )
84 cm = 12 cm + 4l
4l = 84 cm - 12 cm
4l = 72 cm
l = 72 cm/4
l = 18 cm
p = 6 cm + l
p = 6 cm + 18 cm
p = 24 cm
Luas persegi panjang
= p x l
= 24 cm x 18 cm
= 432 cm²