A convex polygon has only the vertices A, B, C, D, E, F, and G. What is the sum of the measures of the interior angles of this polygon?
900
360
1080
1260
Marina is building a triangular sandbox for her daughter. If she has two boards that measure 3ft and 7.25ft, which of the following lengths could Marina use for the third side of the triangular sandbox?
4.25ft
10.25ft
7.25ft
3ft
Cindy used two 12 ft boards to make diagonal braces for her rectangular barn door. When she nailed them up, one of the braces fit and one was too short. What is the best explanation for this? (Figure may not be drawn to scale.)