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→ Mapel : Math→ Materi : Luas dan Keliling
→ Bab : Bangun Datar
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a. Panjang sisi
= √( 12 ÷ 2 )² + ( 16 ÷ 2 )
= √( 6² + 8² )
= √( 36 + 64 )
= √( 100 )
= 10 cm
b. Keliling belah ketupat
= 4 x s
= 4 x 10
= 40 cm
c. Luas belah ketupat
= 1/2 x D1 x D2
= 1/2 x 12 x 16
= 96 cm²