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= panjang rusuk = 39² - 36²
= 1521 - 1296
= √225 = 15
= 15 x 2 = 30 cm
= keliling = 4 x s
= 4 x 30 = 120 cm
B. L.p = ( 4 x Δ ) + L Persegi
= ( 4 x 585 ) + ( 30 x 30 )
= 2340 + 900 = 3240 cm²