Prove that the sum of the angles of mass in each triangle is 180 ° using the knowledge obtained for the two parallel lines cut by one third

Find the value of the variable and the length of each secant segment.

Ahomeowner plans to hang wallpaper on one wall of a bedroom that is 10 feet long if a stripe of wallpaper is 20 inches wide and stripes or hung vertically how many stripes on wall paper with the homeowner required

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