mjwaple57
11.10.2020 •
Mathematics
Find the unknown angle
how to solve this problem??
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Ответ:
a)Find x and y
BCD=ACB+ACD
180°=ACB+150°
ACB=180°-150°
ACB=30°
since triangle ABC is an isosceles triangle
therefore, AB=BC
BAC=ACB
y=ACB=30°
ACB+ABC+BAC=180°
ABC+2BAC=180°
ABC+2*30°=180°
ABC=180°-60°
ABC=120°
X=120°
Ответ:
(11.765% rounded up is 12%)