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= 48 cm . 14 cm : 2
= 24 cm . 14 cm
= 336 cm²
Panjang sisi belah ketupat = √ (1/2 . diagonal1)² + (1/2 . diagonal2)²
= √ (1/2 . 48 cm)² + (1/2 . 14 cm)²
= √ 24² + 7²
= √ 576 + 49
= √ 625
= 25 cm
maka, keliling belah ketupat = 4 . sisi
= 4 . 25 cm
= 100 cm
Keliling = 100