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diagonal1=30 sisi tegak=30/2=15
sisi datar= 8
diagonal2=8×2=16
luas: (1/2)30×16=240
d2= 16 cm, dari = = 8,karena masih setengah diagonal,jadi dikali 2 = 16 cm
luas=
= 30 x 16/2 = 30 x 8 = 240