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cari tingginya dulu = 21*8/6=28
luas= 21*28=588 cm^2
perbandingan luas sebelom Dan sesudah
8*6 : 21*28
4:49
no 8
lebar = 12*60/96=7,5
tinggi= 12*72/96=9
luas permukaan sebenarnya = 2(96*60 +96*72 +60*72)
=2(5760+6912+4320)
=2(16992)
=33984
luas model
2(12*9 + 12*7,5 + 9*7,5)
=2(108+90+67,5)
=2(265,5)
=531
volum sebenarnya
=96*72*60
=414.720
olum model
=12*9*7,5
=810
luas 21x28=588
perbandingan luas
8x6 : 21x28
4 : 49
n0 8
lebar 7,5
tinggi 9
luas permukaan = 2(pl+pt+lt)
luas sebenrnya = 2 (96x60 + 96x72 + 72x60) = 33.984
luas model = 2(12x9 + 12x7,5 + 9x7,5 ) = 531
volum sebenarny = 96x72x60 = 414.720
volum model = 12x9x7,5 = 810