luas belah ketupat = 1/2 . d1 .d2
=1/2 . 21dm .26 dm
=273dm³
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= 1/2 × 21 × 26
= 273 dm²
26 dm = 21 dm + 5 dm
luas belah ketupat = 1/2 . d1 .d2
=1/2 . 21dm .26 dm
=273dm³