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One angle of a seven-sided polygon is 114°, and each of the other six angles is x°. Then the magnitude of x is ______.

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Question

One angle of a seven-sided polygon is 114°, and each of the other six angles is x°. Then the magnitude of x is ______.

Options

  • 131°

  • 132°

  • 135°

  • 130°

MCQ
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Solution

One angle of a seven-sided polygon is 114°, and each of the other six angles is x°. Then the magnitude of x is 131°.

Explanation:

The sum of the interior angles of a seven-sided polygon is given by (7 − 2)  180°, which equals 900°. Setting up the equation 114° + 6x° = 900° and solving for x yields 6x = 786, resulting in x = 131.

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Chapter 13: Rectilinear Figures [Quadrilaterals: Parallelogram, Rectangle, Rhombus, Square and Trapezium] - Exercise 13 (A) [Page 190]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 13 Rectilinear Figures [Quadrilaterals: Parallelogram, Rectangle, Rhombus, Square and Trapezium]
Exercise 13 (A) | Q 1. (a) | Page 190
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