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Triangles — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSTriangles4 Marks
Question
In the given figure, $\triangle ABC$ is an equilateral triangle whose base BC is produced to D such that $BC = CD$. Calculate :
(i) $\angle ACD$
(ii) $\angle ADC$.
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Answer

(i) $\angle ACD =120$
(ii) $\angle ADC =30$

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