PLEASE HELP ILL GIVE BRAINIEST The triangular base of the prism shown has one interior angle that
measures 80° and another interior angle that measures 40°. What is the
measure of the third interior angle?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

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

Kristen is wrapping presents for the holidays. she has a box that measures 4 ft. x 2 ft. x 2 ft. how many square feet of wrapping paper does she need to cover the box without overlapping?