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swaggyd6603
12.08.2020 •
Mathematics
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Ответ:
112°
Step-by-step explanation:
Arc CD is part of arc BCD, which is intercepted by the inscribed angle A.
Based on the inscribed angle theorem on circle, the sum of arc CD and CB is twice the measure of angle A.
That is:
CD + CB = 2(129°)
CD + 146 = 2*129
CD + 146 = 258
Subtract 146 from both sides to find CD
CD + 146 - 146 = 258 - 146
CD = 112°
Ответ:
C
Step-by-step explanation:
The reason water has a bent shape is that the two lone pair of electrons are on the same side of the molecule. This repulsion of the lone pairs of electrons on the oxygen atom causes the bond of the hydrogen to the oxygen to be pushed downward