Find the Size of Angle x in a Circle Geometry Problem

Math Problem Statement

This circle is centred at O. Find the size of angle x, given that angle ABC = 43°. Justify your answer.

The problem asks to find the size of angle $x$ in

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Geometry
Circle Theorems
Angles in a Circle

Angle at the center and circumference theorem
Opposite angles in a cyclic quadrilateral

Grades 8-10

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