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L = setengah (alas x tinggi)
L = (1 dm x 3 dm)
= x 3dm
= 1,5 dm²
cari luas juring:
L = x x 1 dm x 1dm
L = 0,628 dm²
luas daerah yang diarsir:
L = 1,5 dm² - 0,628 dm²
= 0,872 dm² (D)