Penjelasan dengan langkah-langkah:
K = 4s
64 = 4s
s = 64/4
s = 16 cm
luas persegi panjang = luas persegi
L = s × s
L = 16 × 16
L = 256 cm²
Luas persegi panjang
L = p × l
256 = p × 80
p = 256/80
p = 3,2 cm
maka keliling persegi panjang
K = 2p + 2l
K = 2.3,2 + 2.80
K = 6,4 + 160
K = 166,4 cm
======
K = 4 × s
64 = 4 × s
64/4 = s
16 = s
---
L = S²
L = 16 × 16
L = 256 cm²
-----
K = P × L
256 = P × 80
256/80 = P
3,2 = P
----
K = 2(P + L)
K = 2(3,2 + 80)
K = 2(83,2)
K = 166,4 cm
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