perhatikan layang-layang pqrs berikut jika panjang diagonal QS = 24 cm ,QR 15 cm ,dan PQ 20 cm Tentukan luas layang-layang pqrs ?
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Penyelesaian:
PR²=QR²+PQ²
PR²=15²+20²
PR²=225+400
PR=√625
PR=25cm
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Luas=½×d1×d2
L=½×24×25
L=12×25
L=300cm²
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