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In some (but not all) of these problems, it will be helpful to add or to extend one or more lines or line segments.

 In some (but not all) of these problems, it will be helpful to add or to extend one or more lines or line segments.

 1. Determine a formula for angle x in terms of angles a and b. Explain why your formula is valid (without measuring any angles).

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 2. Given that the lines marked with arrows are parallel, determine the sum of the angles a +b+c+ d. Explain why your answer is valid (without measuring any angles). See if you can find more than one explanation!

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Answer #1

hexagon = 720° Sum of all the angles from om a single point line E180° . let triangle. be the angle inside Lotal = 180° O- 18

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