nina1390
08.10.2019 •
Mathematics
Which of the following sentences is punctuated correctly?
a.
the tiny golden clasp on the dress an antique from the 1920s refused to be unhinged (from its hook).
b.
c.
the tiny golden clasp on the dress-an antique from the 1920s refused to be unhinged from its hook.
the tiny golden, clasp on the dress, an antique from the 1920s—refused to be unhinged from its hook.
d.
the tiny golden clasp on the dress-an antique from the 1920s—refused to be unhinged from its hook.
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Ответ:
G. m∠ABD = 54°
H. m∠DBC = 126°
I. m∠XYW = 40°
J. m∠WYZ = 50°
Step-by-step explanation:
∠ABD and ∠DBC are supplementary angles. This means their angles have a sum of 180°.
m∠ABD = 1/2(68) + 20 = 34 + 20 = 54
m∠DBC = 2(68) - 10 = 136 - 10 = 126
Same concept for ∠XYW and ∠WYZ only this time they are complementary angles. This means their angles have a sum of 90°.
m∠XYW = 1 1/4(40) - 10 = 50 - 10 = 40
m∠WYZ = 3/4(40) + 20 = 30 + 20 = 50