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Mathematics 17 Online
OpenStudy (anonymous):

Why is this answer correct?

OpenStudy (anonymous):

Which of the following describes the correct method to find the measure of angle y? The sum of 2y and an interior angle of each of two equilateral triangles is 360°. y = (360°- 120°) ÷ 2 . The sum of an interior angle of the hexagon and an interior angle of an equilateral triangle is 360°. y = 360° – 60°. The sum of an interior angle of the hexagon and an interior angle of each of two equilateral triangles is 180°. y = 180° – 120°. The sum of the measures of the angles about a vertex is 2y + the sum of two interior angles of the triangle. y = (360°- 240°) ÷ 2.

OpenStudy (anonymous):

The answer is A (The sum of 2y and an interior angle of each of two equilateral triangles is 360°. y = (360°- 120°) ÷ 2 .) But why?

OpenStudy (anonymous):

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