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La = 1/2. d1.d2
jika k = 52
4s = 52
s = 13
1/2 d2 = √13²-12²
= √169-144
= √25
= 5
d2 = 10
La = 1/2.24.10
= 120 cm²
Lp = 2.120 + 52.15
= 240 + 780
= 1020 cm²