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= 1/2 . 4x . 3x
= 1/2 12x²
= 6x²
6x² = 600
x² = 600 / 6
x² = 100
x = 10
diagonal pertama = 10 * 4 = 40 cm
diagonal kedua = 10 * 3 = 30 cm
sisinya = √20² + 15²
= √400 + 225
= √625
= 25 cm
keiling = 4s
= 4(25)
= 100 cm