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11. Construct Arguments Write a proof of the Polygon Interior Angle-Sum Theorem. 12. Make Sense and Persevere What are the measures of the angles

11. Construct Arguments Write a proof of the Polygon Interior Angle-Sum Theorem. 12. Make Sense and Persevere What are the measures of the angles in the right triangles formed by the two regular pentagons shown? 13. Reason Explain why a regular polygon cannot have an interior angle that is 40. 14. Error Analysis Jayesh makes the calculation shown to find the measure of each interior angle of a regular nonagon. What is his error? Sum of measure of exterior angles: 180 9 1,620 . = Sum of measure of interior angles: 1,620 +7=231

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