The sum of the interior angles, s, in an n-sided polygon can be determined using the formula s=180(n-2), where n is the number of sides. benita solves this equation for n and writes the equivalent equation n=s/180+2. using this formula, how many sides does a polygon have if the sum of the interior angles is 1,260?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap