tatenasira
18.07.2019 •
Mathematics
If mbac = 55°, what is mdbc? a. 20°b. 80°c. 70°d. 35°
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Ответ:
According to the isosceles triangle theorem. angle BAC and Angle BCA are equal.
BAC = 55
BCA = 55
Since we know two of the angles we will use the angle addition postulate to find angle ABC.
ABC + BAC + BCA = 180
ABC + 55 + 55 = 180
ABC + 110 = 180
ABC = 70
Line BD is angle bisector of angle B.
SO angle DBC is half the measure of angle ABC.
DBC = 70/2
DBC = 35
The answer is D.
Hope this helps :)
Ответ: