1119diamondlord
07.04.2020 •
Mathematics
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Ответ:
116 cm²
Step-by-step explanation:
The shaded area = outer area - inner area
outer area = πr² ( with r = 6.5 ), thus
outer area = π × 6.5² = 42.25π cm²
inner area = πr² ( with r = 2.3 ), thus
inner area = 5.29π cm²
Thus
shaded area = 42.25π - 5.29π = 36.96π ≈ 116 cm² (to 3 significant figures )
Ответ:
35%
step-by-step explanation: