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Triangles — MATHS STD 7 — Question

ICSE BoardEnglish MediumSTD 7MATHSTriangles2 Marks
Question
Calculate the unknown marked angles of the following figure:
Image
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Answer

We know that the sum of three angles of a triangle is 180°, therefore
In figure,
90° + 30° + x = 180°
⇒ 120° + x = 180°
⇒ x = 180° − 120° = 60°
Hence x = 60°

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