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Ivy2k
05.05.2020 •
Mathematics
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Ответ:
r ≈ 5.26 cm
Step-by-step explanation:
The area (A) of the bigger part is calculated as
A = area of circle × fraction of circle
The angle subtended at the centre by the bigger part = 360° - 165° = 195°
A = πr² ×![\frac{195}{360}](/tpl/images/0639/1946/11f13.png)
Here A = 47, thus
πr² ×
= 47 ( multiply both sides by 360 to clear the fraction )
195πr² = 16920 ( divide both sides by 195π )
r² =
( take the square root of both sides )
r =
≈ 5.26 cm ( to 2 dec. places )
Ответ: