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= 24 x 24
= 576
luas bidang tegak = a x t /2
= 24 x 20 /2
= 240
jumlah seluruh luas sisi = 576 + (240 x 4)
=576 + 960
=1536
=( 24 x 24 ) + 4 ( 20 x (1/2 x 24 )
= (24 x 24 ) + 4( 20 x 12)
= 576 + 4 (240)
= 576 + 960
= 1536 cm²
luas permukaan = 1536 cm²