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K = 60
DIG 1 = 18 cm
maka :
K = 4 x s
60 = 4s
s = 60/4
s = 15
sisi² = 1/2 dig 1² + 1/2 dig2²
15² = (1/2x18)² + 1/2 dig2²
225 = 81 + 1/2 dig²
1/2 dig2² = 225 - 81
dig2² = 144/2
dig 2 = √72
dig 2 = 8,48 cm