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mencari sisi
s=√(1/2 d1)²+(1/2 d2)²
=√(1/2 2√6)²+(1/2 2√3)²
=√ (√6)²+(√3)²
=√6+3
=√9
=3 cm
K=4s=4. 3=12 cm
K = 4 × S
= 4 × 3
= 12 cm