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11.07.2021 •
Mathematics
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Ответ:
Step-by-step explanation:
a + 9 = 15
a = 15 - 9
a = 6
c + 9 = 16
c = 16 - 9
c = 7
d = c + 9
= 7 + 9
= 16
e = d + 15
= 16 + 15
e = 31
P(selecting a boy) = total boy /total pupils = 16/31
Ответ:
Step-by-step explanation:
She can conclude that the measure of the angles must be equal, because vertical angles are angles opposite each other when to lines cross, the only thing they have in common is the vertex, when this happens that pair of angles are congruent.
An image is attached to show an example of vertical angles, which are always congruent.