tlg jwb..!please...bsok dkmpul...!

Keliling persegi panjang = 2 (p+l)
= 2 (8+4)
= 2 (12)
=24
jadi, 24× 10 = 240

K = 2×(p+l)
=2×(8+4)
=2×12
=24

K=24×10
=240 cm