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6+2√3 = p x 6-√12 ...
6+2√3 - 6 +√12 = p
2√3 + √12 = p
2√3 + √4x3 = p
2√3 + 2√3 = p
4√3 = p
p = 4√3
K = 2(p+l)
= 2 (4√3 + 6 - √12)
= 2 ( 4√3 + 6 - 2√3)
= 2 ( 2√3 + 6)
= 4√3 + 12