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K=64 cm
p=8+l
Dit :
L=...?
Peny :
K=2(p+l)
64=2(8+l+l)
32=8+2l
2l=24
l=12 cm
p=8+l
=8+12
=20 cm
L= p l
= 20 x 12
= 240 cm²
∴ Luas persegi panjang adalah 240 cm²
Semoga Membantu
p = 8 + l
K = 2 (p + l)
64 = 2 (8 + l + l)
64 = 2(8 + 2l)
64 = 16 + 4l
4l = 64 - 16
4l = 48
l = 48/4
l = 12 cm
p = 8 + l
p = 8 + 12
p = 20 cm
L = p × l
L = 20 × 12 cm²
L = 240 cm²