One hundred sixty eight square feet of carpet has been ordered for a 12 foot wide room. how long should the room be?

      
                               Area = (length) x (width)

                                                 168 square-feet  =  (length) x (12 ft)

Divide each side by  12-ft :    (168 sq-ft) / (12-ft) = length

                                                                   14-ft  =  length .

Since the carpet has already been ordered and the order
can't be changed, if the room is not  14-ft  long, then the
room must be either cut down or added onto.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle